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Adjective to describe magma or igneous rock rich in silica
Silicic is an adjective to describe magma or igneous rock rich in silica (SiO2). The amount of silica that constitutes a silicic rock is usually defined
Silicic
Any molecule containing Si=O and Si–OH groups
In chemistry, a silicic acid (/sɪˈlɪsɪk/) is any chemical compound containing the element silicon attached to oxide (=O) and hydroxyl (−OH) groups, with
Silicic_acid
Chemical compound, Si(OH)4
compound of silica and silicates and the precursor to other silicic acids [H2xSiOx+2]n. Silicic acids play important roles in biomineralization and technology
Orthosilicic_acid
Huge regional accumulation of igneous rocks
mafic, but also can have significant ultramafic and silicic components, and some are dominated by silicic magmatism." This definition places emphasis on the
Large_igneous_province
Chemical compound
Tetramethyl orthosilicate Other names Tetramethyl orthosilicate Methyl silicate Silicic acid, tetramethyl ester Silicon methoxide TMOS Identifiers CAS Number 681-84-5 Y
Tetramethyl_orthosilicate
Chemical compound naturally occurring as the mineral larnite
hydrosilicate Calcium metasilicate Calcium orthosilicate Micro-cell Silene Silicic acid calcium salt Identifiers CAS Number 1344-95-2 Y 111811-33-7 hydrate Y
Calcium_silicate
Chemical compound
Tetraethyl orthosilicate Other names Tetraethoxysilane Ethyl silicate, tetra- Silicic acid tetraethyl ester Silicon(IV) ethoxide TEOS Tetraethyl silicate (ortho-)
Tetraethyl_orthosilicate
Type of volcanic eruption characterized by steady lava flow
within the magma passes a threshold and results in explosive eruptions. Silicic magma also exhibits this transition between effusive and explosive eruptions
Effusive_eruption
or months. Explosive eruptions usually involve thick, highly viscous, silicic or felsic magma, high in volatiles like water vapor and carbon dioxide
List of largest volcanic eruptions
List_of_largest_volcanic_eruptions
Porous form of silicon dioxide
Silica gel Identifiers CAS Number 112926-00-8 Y 1343-98-2 (Silicic acid) Y ChemSpider none ECHA InfoCard 100.065.880 UNII Y6O7T4G8P9 Y CompTox Dashboard
Silica_gel
Volcanic field in Madagascar
of Cenozoic age in northern Madagascar. Volcanism was at first mainly silicic, producing pyroclastic flows which was followed by the eruption of minor
Ankaizina_volcanic_field
Large igneous province in South America and Africa
reflecting more directly the source of the magmas in the mantle. In Paraná, the silicic rocks are divided into two compositional groups, the Palmas volcanics and
Paraná_and_Etendeka_traps
Volcanic system in Ethiopia
of volcanic fissures, located in Ethiopia. The fissures have produced silicic lava flows, and other fissures south of the volcano have been the source
Alu_(Ethiopia)
American geologist
Calabozos caldera complex: geology, petrology, and geochemistry of a major silicic volcanic center and hydrothermal system in the southern Andes (Thesis)
Anita_Grunder
Hypothetical chemical compound with formula H2SiO3
F. Bechtold (1955): "Polymerization and Properties of Dilute Aqueous Silicic Acid from Cation Exchange" Journal of Physical Chemistry, volume 59, issue
Metasilicic_acid
Silicic acid with the formula (HO)3–Si–O–Si–(OH)3
chemical compound with formula H6Si2O7 or (HO)3SiOSi(OH)3. It is one of the silicic acids and has pyrosilicate as its conjugate base. It was synthesized, using
Pyrosilicic_acid
Phyllosilicate clay mineral
(with kaolinite as an example) has several aspects. In the first place the silicic acid to be supplied to the growing crystal must be in a monomeric form
Kaolinite
Cauldron-like volcanic feature formed by the emptying of a magma chamber
with the greatest mineralization taking place near the youngest and most silicic intrusions associated with each caldera. Explosive caldera eruptions are
Caldera
Earth's most severe extinction event
during the epoch. A second flood basalt event that produced the Choiyoi Silicic Large Igneous Province in southwestern Gondwana between around 286 Ma and
Permian–Triassic extinction event
Permian–Triassic_extinction_event
Molten rock expelled by a volcano during an eruption
silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic lavas have a silica content greater than 63%. They include rhyolite and
Lava
Chemical compounds with at least one silicon atom
hydrated silica gels and colloidal silica dispersions. Many hydrates and silicic acids exist in the most dilute of aqueous solutions, but these are rather
Silicon_compounds
Geologic process in formation of some igneous rocks
cooling, emplacement, or eruption. The sequence of (usually increasingly silicic) magmas produced by igneous differentiation is known as a magma series
Igneous_differentiation
Biogenic pelagic sediment located on the deep ocean floor
Diatoms and radiolarians have evolved to uptake silica in the form of silicic acid, Si(OH)4. Once an organism has sequestered Si(OH)4 molecules in its
Siliceous_ooze
Biogeochemical cycle
atmospheric carbon dioxide. It results in the generation of silicic acid in aqueous environments. Silicic acid, Si(OH)4, is a hydrated form of silica found only
Silica_cycle
Historical locale in Idaho, United States
southernmost named area. It is home to the Idavada Volcanics formation of silicic rocks. The nearest major highway is U.S. Route 93, and the nearest established
Idavada,_Idaho
Volcanic caldera in the United states
(19 mi) long and no more than 7 km (4.3 mi) wide. Pre-collapse third-cycle silicic rocks are broadly divided into the Mount Jackson Rhyolite and the Lewis
Yellowstone_Caldera
Deterioration of rocks and minerals through exposure to the elements
into solid brucite and dissolved silicic acid: Mg2SiO4 + 4 H2O ⇌ 2 Mg(OH)2 + H4SiO4 forsterite + water ⇌ brucite + silicic acid Most hydrolysis during weathering
Weathering
Small tectonic unit in the Pannonian Basin in Europe
The Pelso sensu stricto is therefore composed of Tornaic, Bukkic and Silicic superunits, that evolved south of the Meliata-Halstatt Ocean and the superimposed
Pelso_plate
Lunar dome
and faster cooling, enabling it to pile up into these structures. Such silicic volcanism is rare on the Moon, and it's still unclear how it can occur
Mons_Gruithuisen_Gamma
Type of filament material made from waterglass
linings and reinforcing the material. They can also be used to produce silicic acid fibres by a dry spinning method. These fibres have properties which
Silica_fiber
Volcanic-tectonic depression in Sumatra, Indonesia
depression in the southern part of Sumatra, Indonesia. Historical maars and silicic lava domes are found along the Great Sumatran fault line. Phreatic eruptions
Suwoh
Volcanism away from plate margins
is around 10% silicic and intermediate, with geochemistry similar to such flood basalts as Karoo and Deccan which have undergone silicic assimilation of
Intraplate_volcanism
into felsic/leucocratic, mafic/melanocratic and ultramafic). The term "silicic", widely used in South America, has wider meaning, however, is often used
Acidic_rock
Accumulation of molten rock within the Earth's crust
supereruption takes 105 to 106 years. This raises the question of why the buoyant silicic magma does not break through to the surface more frequently in relatively
Magma_chamber
Chemical compound (OH–)
meaning that it forms by dehydration of carbonic acid H2CO3 (OC(OH)2). Silicic acid is the name given to a variety of compounds with a generic formula
Hydroxide
Chemical reaction damaging concrete
or KOH, calcium hydroxide, also known as portlandite, or (Ca(OH)2), and silicic acid (H4SiO4, or Si(OH)4). For simplification, after a complete exchange
Alkali–silica_reaction
Substance obtained from the dried swim bladders of fish
silicate. Eggs were submerged in solutions of waterglass, and a gel of silicic acid formed, also sealing the pores of the eggshell. Isinglass is also
Isinglass
Large caldera in Colorado, US
composition and forms a single cooling unit despite the huge volume. Dacite is a silicic volcanic rock common in explosive eruptions, lava domes and short thick
La_Garita_Caldera
Hot semifluid material found beneath the surface of Earth
silica content: felsic, intermediate, mafic, and ultramafic. Felsic or silicic magmas have a silica content greater than 63%. They include rhyolite and
Magma
Mountain in British Columbia, Canada
with prominent wrinkled ridges. The lava flow is unusually long for a silicic lava flow. Opal Cone is a member of the Cascade Volcanoes, but it is located
Opal_Cone
Active volcanic belt that covers central-southern Mexico
diminishing lava volume eastward. West of 103°W, silicic volcanism between 7.5 and 3.0 Ma became bimodal (mafic-silicic) in the early Pliocene, creating large dome
Trans-Mexican_Volcanic_Belt
Shield volcano in Oregon, United States
it has a high Poisson's ratio. The oldest rocks in this region include silicic (rich in silica) lava domes from the late Miocene or early Pliocene, which
Newberry_Volcano
Chemical compound
water in the formula. When dissolved in water, it is usually known as silicic acid. It is found in nature as opal, and in the cell walls of diatoms –
Hydrated_silica
Rupture in a planet's crust where material escapes
Such eruptions occur when a very large magma chamber full of gas-rich, silicic magma is emptied in a catastrophic caldera-forming eruption. Ash flow tuffs
Volcano
Anatomical structure
of diatoms. The frustule is composed almost purely of silica, made from silicic acid, and is coated with a layer of organic substance, which was referred
Frustule
Type of conical volcano composed of layers of lava and tephra
silicic lava that show no reaction rim. This is possible only if the lava erupted immediately after mixing since olivine rapidly reacts with silicic magma
Stratovolcano
Igneous rock rich in silica and feldspar
was based on an ancient concept, dating from the 19th century, that "silicic acid" (H4SiO4 or Si(OH)4) was the chief form of silicon occurring in siliceous
Felsic
Study of environmental processes using abundances of isotopes
isotopic fractionation was not expressed during dissolution of sediments. The silicic acid leakage hypothesis (SALH) is a suggested mechanism that aims to explain
Silicon isotope biogeochemistry
Silicon_isotope_biogeochemistry
Volcano in Bolivia
Christensen, P. R.; Greeley, R. (1985-03-01). "Sir-A Observations of a Silicic Shield Volcano in Bolivia". Lunar and Planetary Science Conference. 16:
Sacabaya
Geological feature in East Africa
rifting: New constraints from the isotopic and trace element signatures of silicic magmas from Ethiopian volcanoes". Earth and Planetary Science Letters.
Danakil_Depression
of the Taupō Volcanic Zone, the world's most active area of explosive silicic volcanic activity in geologically recent time. Lake Rotorua is the largest
Lakes_of_Rotorua
Ultra-prominent mountain in Saudi Arabia
hornfels derived from metamorphosed volcanic rocks that originally were silicic and mafic lava flows, tuff breccias, and fragmental greenstones. The middle
Jabal_al-Lawz
Chemical compound
Hafnium silicate is the hafnium(IV) salt of silicic acid with the chemical formula of HfSiO4. Thin films of hafnium silicate and zirconium silicate grown
Hafnium(IV)_silicate
Natural siliceous or siliceous-aluminous material
simple acid-base reaction between calcium hydroxide (as Portlandite) and silicic acid. Ancient Roman use as underwater cement Caesarea Maritima, the Herodian
Pozzolana
Volcanic hotspot in the United States
mid-Miocene volcanism is significantly larger than previously appreciated. Three silicic calderas have been newly identified in northwest Nevada, west of the McDermitt
Yellowstone_hotspot
Oxide of silicon
Ludox Nalcoag Nyacol Santocel Silica Silica aerogel Silica, amorphous Silicic anhydride Silikill Synthetic amorphous silica Vulkasil Mesoporous silica
Silicon_dioxide
Active volcano in Arusha Region, Tanzania
Weathering on the silicic rocks has yielded zeoliths. The chemical composition of the erupted rocks is not steady, with an increase of silicic magma emplacement
Ol_Doinyo_Lengai
Mountain in Chile
of northern Chile. It was built on a basement of ignimbrites. A 7 km² silicic lava flow lies on the saddle between the volcano and Acamarachi. Colachi
Colachi
Three volcanic peaks in Oregon, U.S.
mafic (basaltic) lavas; only South and Middle Sister have an abundance of silicic rocks such as andesite, dacite, and rhyodacite. Mafic magma is less viscous;
Three_Sisters_(Oregon)
Mountain in Argentina
and Argentina with Chile, and behind the volcanic arc lies a chain of silicic volcanoes, of which Galán is a southern member. The whole region has been
Galán
Igneous rock with very large interlocked crystals
pegmatites are composed of quartz, feldspar, and mica, having a similar silicic composition to granite. However, rarer intermediate composition and mafic
Pegmatite
English chemist
victims of the poisoning consumed mineral water that contains high levels of silicic acid, even if they did so twenty-four years after the initial poisoning
Christopher_Exley
Mountain range in Nevada, United States
which were faulted and deformed during the Sevier orogeny. Two periods of silicic volcanism occurred during the Cenozoic producing multiple layers of ash
Delamar_Mountains
Complex of volcanic systems in the Puna of the Andes
referred to as San Bartolo and Silapeti Groups. Since the Miocene, less silicic magmas containing olivine, plagioclase and clinopyroxene have been erupted
Altiplano–Puna volcanic complex
Altiplano–Puna_volcanic_complex
Transitional concept of geologic time
more silicic phases that have a lower melting point. This leads to partial melting and further segregation of the lithosphere. In addition the silicic continental
Rock_cycle
Igneous petrologist, volcanologist, and structural geologist
Noble, Korringa, and other colleagues evaluated mafic, andesitic, and silicic lavas, and ash-flow and air-fall tuff in northwestern Nevada. Through potassium-argon
Marjorie_Korringa
Geological formation in Victoria, Australia
deposited siliciclastics derived from volcanic rocks of the Whitsunday Silicic Large Igneous Province to the East, with suggestions that the sediments
Wonthaggi_Formation
Model of volcanic activities on Earth
is around 10% silicic and intermediate, with geochemistry similar to such flood basalts as Karoo and Deccan which have undergone silicic assimilation of
Plate_theory_(volcanism)
Desert in Arizona
limestone layers and volcanic flows cap the mesas. Numerous layers of silicic volcanic ash occur in the Chinle and provide the silica for the petrified
Painted_Desert_(Arizona)
Oceanic chemical survey
quantities such as total inorganic carbon, alkalinity, nitrate, phosphate, silicic acid, oxygen and apparent oxygen utilisation (AOU), and radiochemical /
Geochemical Ocean Sections Study
Geochemical_Ocean_Sections_Study
Chemical element with atomic number 56 (Ba)
circulation reveals a strong correlation between dissolved barium and silicic acid. The large-scale ocean circulation combined with remineralization
Barium
Large group of volcanoes on the Kamchatka peninsula, Russia
50°N 157.20°E / 51.50; 157.20 (Iliinsky) Diky Greben 350 CE 1040 Minor (Silicic) Kuril 51°27′N 156°59′E / 51.45°N 156.98°E / 51.45; 156.98 (Diky Greben)
Volcanoes_of_Kamchatka
Caldera and its crater lake in Bolivia
P. W.; Drake, R. E.; Carlos, Ramirez R. (10 September 1994). "Effusive silicic volcanism in the Central Andes: The Chao dacite and other young lavas of
Pastos_Grandes
Caldera lake in West Sumatra, Indonesia
Smith (30 October 2004). "Correspondence between glass-FT and 14C ages of silicic pyroclastic flow deposits sourced from Maninjau caldera, west-central Sumatra"
Lake_Maninjau
Rock formed through the cooling and solidification of magma or lava
rocks were called silicic or acidic where the SiO2 was greater than 66% and the family term quartzolite was applied to the most silicic. A normative feldspathoid
Igneous_rock
Large volcanic caldera in New Zealand
(12 July 2023). "Multi-method constraints on the age and timescale of silicic small-volume eruptions of Puketerata Volcanic Complex, Taupō Volcanic Zone
Whakamaru_Caldera
Approach to carbon sequestration
Power, lan M. (2011). "Enhanced silicate weathering is not limited by silicic acid saturation". Proceedings of the National Academy of Sciences. 108
Enhanced_weathering
Major undersea volcanic eruption in the Kermadec Islands of New Zealand
Daniel; Caratori-Tontini, Fabio (5 January 2018). "The largest deep-ocean silicic volcanic eruption of the past century". Science Advances. 4 (1) e1701121
2012 Kermadec Islands eruption
2012_Kermadec_Islands_eruption
Long-term oceanographic study by the Bermuda Institute of Ocean Sciences
biogeochemical interest including: nutrients (nitrate, nitrite, phosphate and silicic acid), dissolved inorganic carbon, oxygen, HPLC of pigments, primary production
Bermuda Atlantic Time-series Study
Bermuda_Atlantic_Time-series_Study
usually erupt effusive basaltic lava but can have infrequent explosive silicic eruptions followed by extrusion of intermediate composition lava. However
Volcanism_of_Iceland
Chemical element with atomic number 26 (Fe)
Taylor, A.G.; Twining, B.S. (2011). "Co-limitation of diatoms by iron and silicic acid in the equatorial Pacific". Deep-Sea Research Part II: Topical Studies
Iron
Concrete with rebar
dissociates at high pH (12.5 - 13.5) in alkaline water. The soluble dissociated silicic acid reacts in the porewater with the calcium hydroxide (portlandite) present
Reinforced_concrete
Graph of polyprotic acid concentration compared to pH
fuel combustion. The Bjerrum plots for other polyprotic acids, including silicic, boric, sulfuric and phosphoric acids, are other commonly used examples
Bjerrum_plot
Medication used to treat high blood potassium
data Bioavailability Not absorbed Excretion Feces Identifiers IUPAC name Silicic acid, sodium zirconium(4+) salt (3:2:1), hydrate CAS Number 17141-74-1
Sodium zirconium cyclosilicate
Sodium_zirconium_cyclosilicate
Volcanic field in Bolivia
Luedke, R. G. (1998-04-01). "Petrochemistry of Late Miocene Peraluminous Silicic Volcanic Rocks from the Morococala Field, Bolivia". Journal of Petrology
Morococala
Extinction event around 260 million years ago
flood volcanism, SW China: Geochemistry and SHRIMP zircon U–Pb dating of silicic ignimbrites, post-volcanic Xuanwei Formation and clay tuff at the Chaotian
Capitanian mass extinction event
Capitanian_mass_extinction_event
Mechanical property that measures stiffness of a solid material
(C), synthetic 1,050–1,210 152×10^6–175×10^6 Diatom frustules, largely silicic acid 0.35–2.77 0.051×10^6–0.402×10^6 Flax fiber 58 8.4×10^6 Float glass
Young's_modulus
Volcano on the Japanese island of Hokkaido
Shiribetsu Dake - Geological Survey of Japan "Evolution of the Quaternary silicic volcanic complex of Shiribetsu, Hokkaido, Japan: an example of ignimbrite
Mount_Shiribetsu
Persian physician
seems to have had some knowledge about arsenious oxide, cupric oxide, silicic acid, and antimony; he knew the toxicological effects of copper and lead
Abu_Mansur_Muwaffaq
American volcanologist (born 1954)
formation in eruptions. She also has interests in intermediate composition and silicic volcanoes, particularly at Mount St. Helens. Cashman was elected to the
Katharine_Cashman
Nazi-controlled industrial conglomerate in WWII
Overy, p. 105. Overy, p. 97. Salzgitter ores contained high levels of silicic acid and could not be smelted in conventional furnaces - Neumann, p. 19
Reichswerke_Hermann_Göring
Convergent plate boundary that stretches from the North Island of New Zealand northward
the western Pacific". Journal of Volcanology and Geothermal Research. Silicic Volcanism and Crustal Evolution in Oceanic Arcs. 156 (3): 315–331. Bibcode:2006JVGR
Tonga–Kermadec subduction zone
Tonga–Kermadec_subduction_zone
Volcano in Arizona, United States
been identified – the more silicic volcanic centers appear to have begun with basaltic activity and then evolved to more silicic compositions. San Francisco
San_Francisco_volcanic_field
Stratovolcano in the Cascade Range, Oregon, US
amphibolite and at deeper strata, granulite, have both produced intermediate and silicic lavas at Jefferson. The strip may still be active, as monogenetic vents
Mount_Jefferson_(Oregon)
Dataset of ocean properties
apparent oxygen utilisation (AOU), percent oxygen saturation, phosphate, silicic acid, and nitrate. Early editions of the WOA additionally included fields
World_Ocean_Atlas
Type of volcano
intermediate composition, such that they are chemically bimodal. Large silicic eruptions at central volcanoes often result in the formation of one or
Central_volcano
Hygroscopic chemical compound of variable Na2O/SiO2 ratio precursor of waterglass
In acidic solutions, the silicate ions react with hydrogen ions to form silicic acids, which tend to decompose into hydrated silicon dioxide gel.[citation
Sodium_silicate
Type of lava dome found on the planet Venus
Venus "Shapes of Venusian 'Pancake' Domes Imply Episodic Emplacement and Silicic Composition". "Unusual Volcanoes on Venus". volcano.oregonstate.edu. Archived
Pancake_dome
Village in Zanjan province, Iran
copper and gold. hydrothermal alteration, extensive breccia formation, and silicic veins are among the significant characteristics of the Khalifehlu deposit
Khalifehlu,_Khorramdarreh
Miocene caldera in the Potosi department, Bolivia
as of July 2025 (link) Francis, P. W.; Wood, C. A. (1982). "Absence of silicic volcanism on Mars: Implications for crustal composition and volatile abundance"
Kari-Kari_(caldera)
SILICIC
SILICIC
SILICIC
SILICIC
Surname or Lastname
English
English : patronymic from Spink.
Male
Greek
(ΟφιοÏχος) Greek name OPHIOUCHOS means "serpent bearer." This is the name of a constellation depicted as a man supporting a serpent. The man is thought by some to be the demigod Asklepios, who learned the secret of life and death from a serpent and was killed for this by Zeus to prevent him from sharing his knowledge with mankind.
Male
English
Pet form of English Arnold, ARNY means "eagle power."
Boy/Male
Indian, Tamil
King
Girl/Female
German
An Old German name derived from words meaning 'god' and 'peace'.
Girl/Female
Hindu, Indian, Tamil
God
Boy/Male
Indian, Punjabi, Sikh
Warrior of the World
Girl/Female
Tamil
Rainfall, Heavy rain
Girl/Female
French Irish American
Dark.
Girl/Female
Hindu
Twilight
SILICIC
SILICIC
SILICIC
SILICIC
SILICIC
n.
Silica, SiO2 as found in nature, constituting quarz, and most sands and sandstones. See Silica, and Silicic.
a.
Capable of neutralizing four molecules of a monacid base; having four hydrogen atoms capable of replacement by bases; quadribasic; -- said of certain acids; thus, normal silicic acid, Si(OH)4, is a tetrabasic acid.
a.
Pertaining to, derived from, or resembling, silica; specifically, designating compounds of silicon; as, silicic acid.
n.
A double salt of boric and silicic acids, as in the natural minerals tourmaline, datolite, etc.
a.
Consisting of silica and calcareous matter.
n.
A salt of silicic acid.
a.
Of or pertaining to compounds formed by the condensation of two or more molecules of silicic acid.
a.
Designating an acid derived from silicic acid by the removal of water; of or pertaining to such an acid.
a.
Designating the form of silicic acid having the normal or highest number of hydroxyl groups.
n.
A silicate formed with the lowest proportion of silicic acid, or having but one atom of silicon in the molecule.