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Classification of crystalline materials by their three-dimensional structural geometry
crystallography, a crystal system is a set of point groups (a group of geometric symmetries with at least one fixed point). A lattice system is a set of Bravais
Crystal_system
Union of crystal groups with related structures and lattices
hexagonal crystal family is one of the six crystal families, which includes two crystal systems (hexagonal and trigonal) and two lattice systems (hexagonal
Hexagonal_crystal_family
One of the 7 crystal systems in crystallography
monoclinic crystal system is one of the seven crystal systems. A crystal system is described by three vectors. In the monoclinic system, the crystal is described
Monoclinic_crystal_system
Crystallographic system where the unit cell is in the shape of a cube
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube. This is one of the most
Cubic_crystal_system
Type of three-dimensional crystal structural geometry
In crystallography, the orthorhombic crystal system is one of the seven crystal systems. Orthorhombic lattices result from stretching a cubic lattice along
Orthorhombic_crystal_system
Lattice point group
In crystallography, the tetragonal crystal system is one of the seven crystal systems. Tetragonal crystal lattices result from stretching a cubic lattice
Tetragonal_crystal_system
One of the seven crystal systems
anorthic) crystal system is one of the seven crystal systems. A crystal system is described by three basis vectors. In the triclinic system, the crystal is described
Triclinic_crystal_system
Solid material with highly ordered microscopic structure
crystallographic space groups. These are grouped into 7 crystal systems, such as cubic crystal system (where the crystals may form cubes or rectangular boxes, such
Crystal
Ordered arrangement of atoms, ions, or molecules in a crystalline material
crystal lattice. Some directions and planes are defined by symmetry of the crystal system. In monoclinic, trigonal, tetragonal, and hexagonal systems
Crystal_structure
Phenomenon in crystallization
Crystal twinning occurs when two or more adjacent crystals of the same mineral are oriented so that they share some of the same crystal lattice points
Crystal_twinning
Symmetry group of a configuration in space
the hexagonal crystal system, and consists of the hexagonal crystal system together with the 18 groups of the trigonal crystal system other than the
Space_group
Mineral made of silicon and oxygen
crystallizes in the trigonal crystal system, while β-quartz has greater symmetry and crystallizes in the hexagonal crystal system. The transition from α-quartz
Quartz
Calcium carbonate mineral
environments. The crystal lattice of aragonite differs from that of calcite, resulting in a different crystal shape, an orthorhombic crystal system with acicular
Aragonite
Copper silicate hydroxide mineral
orthorhombic – dipyramidal crystal system and usually occurs in a granular massive form and also as fibrous acicular crystals. It is closely allied to plancheite
Shattuckite
Red mercury(II) sulfide mineral, HgS
that is a hexagonal crystalline lattice belonging to the trigonal crystal system, crystals that sometimes exhibit twinning. Cinnabar has been used for its
Cinnabar
Structure that repeats in time; a novel type or phase of non-equilibrium matter
a time crystal is a quantum system of particles whose lowest-energy state is one in which the particles are in repetitive motion. The system cannot lose
Time_crystal
Mineral variety of copper carbonate
Cu2CO3(OH)2. This opaque, green-banded mineral crystallizes in the monoclinic crystal system, and most often forms botryoidal, fibrous, or stalagmitic masses, in
Malachite
Semi-precious gemstone
belongs to the plagioclase feldspar group and forms within the triclinic crystal system, appearing in colorless, white, slight orange, or green varieties with
Moonstone_(gemstone)
State of matter with properties of both conventional liquids and crystals
Liquid crystal (LC) is a state of matter whose properties are between those of conventional liquids and those of solid crystals. There are many types of
Liquid_crystal
Mineral or gemstone
in the cubic crystal system. The name comes from the Latin word spinella, a diminutive form of spine, in reference to its pointed crystals. Spinel crystallizes
Spinel
Natural mineral form of lead sulfide
and widely distributed sulfide minerals. It crystallizes in the cubic crystal system often showing octahedral forms. It is often associated with the minerals
Galena
Microcrystalline or cryptocrystalline form of silica
symmetry, crystallizing in the trigonal crystal system while moganite crystallizes in the monoclinic crystal system. Over geological time, the metastable
Chalcedony
Plagioclase feldspar with 50–70% anorthite
1.573 and twinning is common. As with all plagioclase members, the crystal system is triclinic, and three directions of cleavage are present, two of which
Labradorite
Variety of beryl
family. It is transparent to translucent and possesses a hexagonal crystal system. Aquamarine is a fairly common gemstone, rendering it more accessible
Aquamarine_(gem)
Type of American spy satellite
The KH-11 KENNEN (later renamed CRYSTAL, then Evolved Enhanced CRYSTAL System, and codenamed 1010 and Key Hole) is a type of reconnaissance satellite
KH-11_KENNEN
Naturally occurring mineral form of calcium apatite
producing fluorapatite or chlorapatite. It crystallizes in the hexagonal crystal system. Pure hydroxyapatite powder is white. Naturally occurring apatites can
Hydroxyapatite
Mineral, semi-precious stone
dodecahedral crystal habit, but are also commonly found in the trapezohedron habit as well as the hexoctahedral habit. They crystallize in the cubic system, having
Garnet
Zirconium silicate mineral
present in quantities ranging from 1 to 4%. The crystal structure of zircon is tetragonal crystal system. The natural color of zircon varies between colorless
Zircon
Mineral of manganese carbonate
3.45 and 3.6. The crystal system of rhodochrosite is trigonal, with a structure and cleavage in the carbonate rhombohedral system. The carbonate ions
Rhodochrosite
Silicate mineral
relatively low index of refraction. It has the orthorhombic crystal system and a dipyramidial crystal class. It occurs in many places in the world. Two of the
Topaz
History of geometrical crystallography to 1895
7 crystal systems, the 32 crystal classes, the 14 Bravais lattices, and the 230 space groups. The study of the geometrical properties of crystals began
Geometrical crystallography before X-rays
Geometrical_crystallography_before_X-rays
Zeolite mineral
the isometric-hexoctahedral crystal system as colorless, white, gray, or rarely pink and blue masses. Well-formed crystals are rare. It has a Mohs hardness
Pollucite
Blue mineral
Al)2Si6O18). It crystallizes in the hexagonal crystal system typically as small blue hexagonal crystals up to 2 cm length. It has a Mohs hardness of 6
Bazzite
Gemstone: beryllium aluminium silicate
aquamarine. Naturally occurring hexagonal crystals of beryl can be up to several meters in size, but terminated crystals are relatively rare. Pure beryl is colorless
Beryl
Carbonate mineral
and a Mohs hardness of 1. It crystallizes in the monoclinic-domatic crystal system, typically forming efflorescences and encrustations. The term hydrated
Natron
Notation to represent symmetry in point groups, plane groups and space groups
center. These are the crystallographic point groups 1 and 1 (triclinic crystal system), 2, m, and 2/m (monoclinic), and 222, 2/m2/m2/m, and mm2 (orthorhombic)
Hermann–Mauguin_notation
Refractive property of materials
difference between refractive indices exhibited by the material. Crystals with non-cubic crystal structures are often birefringent, as are plastics under mechanical
Birefringence
Mineral, quartz variety
metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. The irradiation causes the iron (Fe+3) ions that
Amethyst
Mineral known as rock salt
mineral (natural) form of sodium chloride (NaCl). Halite forms isometric crystals. The mineral is typically colorless or white, but may also be light blue
Halite
Sulfide mineral
crystal system with the chemical composition Mn2+S and develops commonly massive to granular aggregates, but rarely also cubic or octahedral crystals
Alabandite
Lead chromate mineral
consisting of lead chromate, PbCrO4, and crystallizing in the monoclinic crystal system. It is identical in composition with the artificial product chrome yellow
Crocoite
Classification system for crystals
crystallographic point group defines the (geometric) crystal class of the crystal. The point group of a crystal determines, among other things, the directional
Crystallographic_point_group
Phyllosilicate mineral in the dioctahedral mica group
transparent or translucent. It is anisotropic and has high birefringence. Its crystal system is monoclinic. The green, chromium-rich variety is called fuchsite;
Muscovite
Rare uranium sulfate mineral
crystallizes in the triclinic crystal system with the chemical composition Cu[UO2(OH)SO4]2·8H2O. It crystallizes in the triclinic system and develops only small
Johannite
Feldspathoid mineral in the cancrinite group
Sabatini from which it was discovered in Latium, Italy. It has a hexagonal crystal system, meaning crystallographically it has three horizontal axes of equal
Sacrofanite
Mineral composed of iron(II) carbonate
assist in its identification. It crystallizes in the trigonal crystal system; crystals are rhombohedral in shape, typically with curved and striated faces
Siderite
dark green crystal coatings. It crystallizes in the cubic crystal system and occurs as well formed cubic, octahedral and dodecahedral crystals. It is a
Bunsenite
Inosilicate of calcium and aluminium
orthorhombic crystal system, and most often forms as stalactitic, botryoidal, reniform or globular aggregates, with only just the crests of small crystals showing
Prehnite
Green gem-quality mineral
isomorphic olivine, silicate, magnesium and iron in an orthorhombic crystal system. In an alternative view, the atomic structure can be described as a
Peridot
Iron manganese tungstate mineral
reddish black coloration. Wolframite in its pure crystal form exhibits a monoclinic crystal system with a perfect cleavage of {010} and an iron black
Wolframite
Mineral, anhydrous calcium sulfate
mineral with the chemical formula CaSO4. It is in the orthorhombic crystal system, with three directions of perfect cleavage parallel to the three planes
Anhydrite
Silicon carbide mineral
1893. At first, he mistakenly identified the crystals as diamonds, but in 1904 he identified the crystals as silicon carbide. Artificial silicon carbide
Moissanite
Visible shape of a mineral
mineralogy, crystal habit is the characteristic external shape of an individual crystal or aggregate of crystals. The habit of a crystal is dependent
Crystal_habit
Topics referred to by the same term
pattern. Crystal or Crystals may also refer to: The Crystals, an American pop music girl group Crystal, the artistic name of Gaudelia Díaz Crystal, the former
Crystal_(disambiguation)
Nesosilicate mineral
crystallizes in the monoclinic crystal system and is typically massive to fibrous as well as in slender prismatic crystals. It is related to beryl (Be3Al2Si6O18)
Euclase
Gem variety of corundum
synthetically in laboratories for industrial or decorative purposes in large crystal boules. It occurs in association with ruby, zircon, biotite, muscovite
Sapphire
Rare variety of beryl
attributed to Mn3+ ions. Red beryl rough crystals can be easily distinguished by hexagonal crystal systems. This gem has been known to be confused with
Red_beryl
Mineral
Creek, Oregon, United States. Oregonite crystallises in the hexagonal crystal system and has a Mohs hardness of 5. Oregonite is known, apart from its type
Oregonite
Phosphate mineral
significant amounts of the other. Fluorapatite crystallizes in a hexagonal crystal system. It is often combined as a solid solution with hydroxylapatite (Ca5(PO4)3OH
Fluorapatite
Solid material whose physical properties are independent of orientation
metals of the cubic crystal system can be described with single scalar value, rather than a tensor. Additionally, cubic crystals are isotropic with respect
Isotropic_solid
Sulfosalt mineral Ag4MnSb2S6
mineral with formula Ag4MnSb2S6. It crystallizes in the monoclinic crystal system with a typical slender radiating prismatic habit. It is metallic black
Samsonite_(mineral)
Iron-rich pyroxene mineral
the iron-rich end member of the pyroxene group having a monoclinic crystal system. The mineral is extremely rarely found as a pure substance, and usually
Hedenbergite
Piece of mineral crystal used to make jewelry
made of aluminium oxide (Al 2O 3). Many gems are crystals which are classified by their crystal system such as cubic or trigonal or monoclinic. Another
Gemstone
Silicate mineral
rare silicate mineral with the formula Na2Ca2Si3O9. It has a trigonal crystal system. It was first described in 1957 for an occurrence in nephelinite lavas
Combeite
Zirconium oxide mineral
baddeleyite. It belongs to the monoclinic-prismatic class, of the P21/c crystal system. It has been used for geochronology. Baddeleyite was first found in
Baddeleyite
2000 video game
service called "Mobile System GB". These enhancements were made possible by the Game Boy Color's improved hardware, making Crystal the first game in the
Pokémon_Crystal
Association football club in London, England
Crystal Palace Football Club, often referred to simply as Palace, is a professional football club based in Selhurst, South London, England, which competes
Crystal_Palace_F.C.
Lead carbonate mineral
the orthorhombic crystal system and is isomorphous with aragonite. Like aragonite it is very frequently twinned, the compound crystals being pseudo-hexagonal
Cerussite
Natural alloy containing copper and gold
Its chemical formula is Cu3Au. The alloy crystallizes in the cubic crystal system in the L12 structure type and occurs as malleable grains or platey masses
Auricupride
Silver antimonide mineral
the orthorhombic crystal system. It forms pyramidal crystals up to 5 cm (2.0 in) and can also form cylindrical and prismatic crystals. Dyscrasite is a
Dyscrasite
Topics referred to by the same term
"having equal measurement". isometric may mean: Cubic crystal system, also called isometric crystal system Isometre, a rhythmic technique in music. "Isometric
Isometric
Hydrous magnesium sulfate mineral
or yellowish. Its hardness is 3.5 and crystallizes in the monoclinic crystal system. Gunningite is the zinc member of the kieserite group of minerals. It
Kieserite
Mineral form of lead tetroxide
occurs in scaly-to-earthy masses. It crystallizes in the tetragonal crystal system. Minium is rare and occurs in lead-mineral deposits that have been subjected
Minium_(mineral)
Carbide mineral
It has a chemical formula of (Fe,Ni)23C6, crystallises in the cubic crystal system and has a Mohs hardness of 5+1⁄2 - 6. It was first described in 1971
Haxonite
Gold telluride mineral
gold-silver tellurides, calaverite and sylvanite, are in the monoclinic crystal system, whereas krennerite is orthorhombic. The color varies from silver-white
Krennerite
Transparent, yellow variety of quartz
citrine crystals from Russia Natural citrine crystal from Brazil Cut natural citrine Tumbled "citrine" (heat-treated amethyst) "Citrine" crystal (heat-treated
Citrine
Orange-yellow arsenic sulfide mineral
group. They are both arsenic sulfides and belong to the monoclinic crystal system. They are found in the same deposits and can form in the same geologic
Orpiment
Calcium carbonate mineral
as mu-calcium carbonate (μ-CaCO3). Vaterite belongs to the hexagonal crystal system, whereas calcite is trigonal and aragonite is orthorhombic. Vaterite
Vaterite
Rare metallic iron silicide mineral
Xifengite (Fe5Si3) is a rare metallic iron silicide mineral. The crystal system of xifengite is hexagonal. It has a specific gravity of 6.45 and a Mohs
Xifengite
Iron(II) oxide (FeO) mineral formed under reducing conditions
reflected light. Wüstite crystallizes in the isometric-hexoctahedral crystal system in opaque to translucent metallic grains. It has a Mohs hardness of
Wüstite
Series of zeolite minerals
crystallizes in the triclinic crystal system with typically rhombohedral shaped crystals that are pseudo-cubic. The crystals are typically twinned, and both
Chabazite
Sulfide mineral
hardness of 2.5–3 on the Mohs scale. It is a sulfide with a monoclinic crystal system. The term chalcocite from the Greek khalkos, meaning "copper". It is
Chalcocite
Variety of corundum, mineral, gemstone
time when the crystal lattice of ruby is in an excited state before fluorescence occurs. If 694-nanometer photons pass through the crystal during that time
Ruby
Shape with six sides
for its vaguely hexagonal shape. Hexagonal Hanksite crystal, one of many hexagonal crystal system minerals Hexagonal barn The Hexagon, a hexagonal theatre
Hexagon
Tectosilicate mineral in the feldspathoid group
minerals. It forms blue to colorless, typically massive crystals in the trigonal crystal system. The lowering of the symmetry from typical (for cancrinite
Afghanite
Fourier transform of a real-space lattice, important in solid-state physics
or real lattice is a periodic function in physical space, such as a crystal system (usually a Bravais lattice). The reciprocal lattice exists in the mathematical
Reciprocal_lattice
Calcium manganese silicate mineral
a needle-like crystal habit; in stacked crystal plates, and wheat sheaf crystal groups. It can also form individual pyramidal crystals, however, those
Olmiite
Copper iron sulfide mineral
malachite, azurite, and cuprite. Chalcopyrite is a member of the tetragonal crystal system. Crystallographically the structure of chalcopyrite is closely related
Chalcopyrite
soft mineral with a Mohs hardness of 2–3. Ameghinite has a monoclinic crystal system. It was first described in 1967 for an occurrence in the Tincalayu Mine
Ameghinite
Opaque, blue-to-green mineral
almost never forms single crystals, and all of its properties are highly variable. X-ray diffraction testing shows its crystal system to be triclinic. With
Turquoise
Sulfide mineral
light bronze to brassy yellow grains which crystallize in the trigonal crystal system. It has a hardness of 4, a specific gravity of 5.82. Heazlewoodite was
Heazlewoodite
Molybdenum disulfide mineral
Molybdenite crystallizes in the hexagonal crystal system as the common polytype 2H and also in the trigonal system as the 3R polytype. Molybdenite occurs
Molybdenite
Thomsonite series of the zeolite group
Scotland in 1820. It is named for the Scottish chemist Thomas Thomson. The crystal system of thomsonite is orthorhombic. The Mohs hardness is 5 to 5.5. It is
Thomsonite
Mineral supergroup
general formulation AB2X4 which crystallise in the cubic (isometric) crystal system, with the X anions (typically chalcogens, like oxygen and sulfur) arranged
Spinel_group
Chromium variety of muscovite
monoclinic crystal system. Common colour of the mineral is pale green to emerald green depending on the amount of Cr substitution. The micaceous crystals are
Fuchsite
Rare chromate mineral
mineral with chemical formula: K2Cr2O7. It crystallizes in the triclinic crystal system. It occurs as rare vug fillings in nitrate ores in association with
Lópezite
Reddish brown to black nesosilicate mineral
nesosilicate mineral with a white streak. It crystallizes in the monoclinic crystal system, has a Mohs hardness of 7 to 7.5 and the chemical formula: Fe2+2Al9O6(SiO4)4(O
Staurolite
a rare mineral with the formula CuSe2. It crystallises in the cubic crystal system. It is part of the pyrite group, being composed of Cu2+ ions and Se22−
Kruťaite
Lithium magnesium aluminium inosilicate mineral
Fe2+)3Al2Si8O22(OH)2. It crystallizes in the orthorhombic crystal system as prismatic crystals up to 10 cm (3.9 in) or as massive aggregates. It has a Mohs
Holmquistite
Mineral form of potassium nitrate
Niter is a colorless to white mineral crystallizing in the orthorhombic crystal system. It is the mineral form of potassium nitrate, KNO3, and is soft (Mohs
Niter
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