Cubic crystal system

cubicisometricface-centered cubicbody-centered cubicface centered cubicfccbccface-centred cubicbody-centred cubicbody centered cubic
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube.wikipedia
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Crystal

crystallinecrystalscrystalline solid
This is one of the most common and simplest shapes found in crystals and minerals.
These are grouped into 7 crystal systems, such as cubic crystal system (where the crystals may form cubes or rectangular boxes, such as Halite (mineral) shown at right) or hexagonal crystal system (where the crystals may form hexagons, such as ordinary water ice).

Crystal system

systemlattice systemcrystallographic point groups
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube.

Crystallography

crystallographercrystallographiccrystallographically
In crystallography, the cubic (or isometric) crystal system is a crystal system where the unit cell is in the shape of a cube.
In another example, iron transforms from a body-centered cubic (bcc) structure to a face-centered cubic (fcc) structure called austenite when it is heated.

Galena

argentiferous galenagalenitelead
Other terms for hexoctahedral are: normal class, holohedral, ditesseral central class, galena type.
It crystallizes in the cubic crystal system often showing octahedral forms.

Bravais lattice

crystal latticelatticeBravais lattices
The three Bravais lattices in the cubic crystal system are:

Mineral

mineralsmineral depositsaccessory mineral
This is one of the most common and simplest shapes found in crystals and minerals.

Halite

rock saltsaltmineral salt
In the rock-salt or sodium chloride (halite) structure, each of the two atom types forms a separate face-centered cubic lattice, with the two lattices interpenetrating so as to form a 3D checkerboard pattern.
Halite forms isometric crystals.

Sphalerite

zinc blendezincblendeblende
The Zincblende structure (also written "zinc blende") is named after the mineral zincblende (sphalerite), one form of zinc sulfide (β-ZnS).
The mineral crystallizes in the cubic crystal system.

Petzite

It forms isometric crystals, and is usually associated with rare tellurium and gold minerals, often with silver, mercury, and copper.

Coordination number

coordinationcoordinatedhexacoordinate
Each sphere in a cF lattice has coordination number 12.
In a body-centered cubic (BCC) crystal, the bulk coordination number is 8, whereas, for the (100) surface, the surface coordination number is 4.

Ullmannite

Johann Christoph Ullmann
Initially thought to be of two species, tetrahedral and cubic, it was later confirmed that both samples conformed to the 23 point group of the isometric crystal class and typically exhibits cubic, octahedral, or pyritohedral forms although euhedral crystals are rare.

Iron

FeFe 2+ Fe(III)
Examples of bcc include iron, chromium, tungsten, and niobium.
As molten iron cools past its freezing point of 1538 °C, it crystallizes into its δ allotrope, which has a body-centered cubic (bcc) crystal structure.

Polonium

Popolonium-210210Po
(Loosely packed arrangements do occur, though, for example if the orbital hybridization demands certain bond angles.) Accordingly, the primitive cubic structure, with especially low atomic packing factor, is rare in nature, but is found in polonium.
The alpha form is the only known example of a simple cubic crystal structure in a single atom basis at STP, with an edge length of 335.2 picometers; the beta form is rhombohedral.

Aluminium

aluminumAlall-metal
Examples of fcc include aluminium, copper, gold and silver.
At standard temperature and pressure, aluminium atoms (when not affected by atoms of other elements) form a face-centered cubic crystal system bound by metallic bonding provided by atoms' outermost electrons; hence aluminium (at these conditions) is a metal.

Tungsten

WwolframTungsten (W)
Examples of bcc include iron, chromium, tungsten, and niobium.
The former has a body-centered cubic structure and is the more stable form.

Pyrite

iron pyritepyritesfool's gold
The structure is simple cubic and was among the first crystal structures solved by X-ray diffraction.

Hermann–Mauguin notation

H-M symbolH–M SymbolHermann-Mauguin notation
The isometric crystal system class names, point groups (in Schönflies notation, Hermann–Mauguin notation, orbifold, and Coxeter notation), type, examples, International Tables for Crystallography space group number, and space groups are listed in the table below.

Silver

Agsilver orenative silver
Examples of fcc include aluminium, copper, gold and silver.
Silver crystallizes in a face-centered cubic lattice with bulk coordination number 12, where only the single 5s electron is delocalized, similarly to copper and gold.

Space group

crystallographic groupspace groupsList of the 230 crystallographic 3D space groups
The isometric crystal system class names, point groups (in Schönflies notation, Hermann–Mauguin notation, orbifold, and Coxeter notation), type, examples, International Tables for Crystallography space group number, and space groups are listed in the table below.
The reducible groups fall into 17 classes corresponding to the 17 wallpaper groups, and the remaining 35 irreducible groups are the same as the cubic groups and are classified separately.

Niobium

NbcolumbiumNiobium (Nb)
Examples of bcc include iron, chromium, tungsten, and niobium.
Although it is thought to have a body-centered cubic crystal structure from absolute zero to its melting point, high-resolution measurements of the thermal expansion along the three crystallographic axes reveal anisotropies which are inconsistent with a cubic structure.

Gallium arsenide

GaAsgallium(III) arsenidegallium-arsenide
Examples of compounds with this structure include zincblende itself, lead(II) nitrate, many compound semiconductors (such as gallium arsenide and cadmium telluride), and a wide array of other binary compounds.
It is a III-V direct band gap semiconductor with a zinc blende crystal structure.

Diamond

diamondsdiamond miningindustrial diamond
Other compounds showing zinc blende-like structure are α-AgI, β-BN, diamond, CuBr, β-CdS, BP and BAs.
At high pressures, silicon and germanium have a BC8 body-centered cubic crystal structure, and a similar structure is predicted for carbon at high pressures.

Weaire–Phelan structure

Kelvin problemKelvin structureKelvin foam
The Weaire–Phelan structure has Pm3n (223) symmetry.

Diamond cubic

diamonddiamond latticediamond crystal
Altogether, the arrangement of atoms in zincblende structure is the same as diamond cubic structure, but with alternating types of atoms at the different lattice sites.
Diamond's cubic structure is in the Fdm space group, which follows the face-centered cubic Bravais lattice.