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Crystal twinning

Index Crystal twinning

Crystal twinning occurs when two separate crystals share some of the same crystal lattice points in a symmetrical manner. [1]

44 relations: Albite, Aragonite, Bravais lattice, Calcite, Cassiterite, Cerussite, Chrysoberyl, Close-packing of equal spheres, Crystal, Crystal system, Crystallite, Crystallography, Cubic crystal system, Dislocation, Dodecahedron, Feldspar, Fluorite, Grain boundary, Gypsum, Homogeneity and heterogeneity, Icosahedral twins, Macle, Martensite, Metamorphism, Metazeunerite, Microcline, Nickel titanium, Octahedron, Orogeny, Orthoclase, Plagioclase, Pyrite, Quartz, Quenching, Rutile, Shock hardening, Spinel, Stacking-fault energy, Staurolite, Steel, Tin cry, Work hardening, X-ray crystallography, X-ray scattering techniques.

Albite

Albite is a plagioclase feldspar mineral.

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Aragonite

Aragonite is a carbonate mineral, one of the two most common, naturally occurring, crystal forms of calcium carbonate, CaCO3 (the other forms being the minerals calcite and vaterite).

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Bravais lattice

In geometry and crystallography, a Bravais lattice, named after, is an infinite array of discrete points in three dimensional space generated by a set of discrete translation operations described by: where ni are any integers and ai are known as the primitive vectors which lie in different directions and span the lattice.

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Calcite

Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3).

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Cassiterite

Cassiterite is a tin oxide mineral, SnO2.

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Cerussite

Cerussite (also known as lead carbonate or white lead ore) is a mineral consisting of lead carbonate (PbCO3), and an important ore of lead.

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Chrysoberyl

The mineral or gemstone chrysoberyl is an aluminate of beryllium with the formula BeAl2O4.

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Close-packing of equal spheres

In geometry, close-packing of equal spheres is a dense arrangement of congruent spheres in an infinite, regular arrangement (or lattice).

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Crystal

A crystal or crystalline solid is a solid material whose constituents (such as atoms, molecules, or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

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Crystal system

In crystallography, the terms crystal system, crystal family and lattice system each refer to one of several classes of space groups, lattices, point groups or crystals.

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Crystallite

A crystallite is a small or even microscopic crystal which forms, for example, during the cooling of many materials.

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Crystallography

Crystallography is the experimental science of determining the arrangement of atoms in crystalline solids (see crystal structure).

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Cubic crystal system

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

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Dislocation

In materials science, a dislocation or Taylor's dislocation is a crystallographic defect or irregularity within a crystal structure.

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Dodecahedron

In geometry, a dodecahedron (Greek δωδεκάεδρον, from δώδεκα dōdeka "twelve" + ἕδρα hédra "base", "seat" or "face") is any polyhedron with twelve flat faces.

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Feldspar

Feldspars (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8) are a group of rock-forming tectosilicate minerals that make up about 41% of the Earth's continental crust by weight.

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Fluorite

Not to be confused with Fluoride. Fluorite (also called fluorspar) is the mineral form of calcium fluoride, CaF2.

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Grain boundary

A grain boundary is the interface between two grains, or crystallites, in a polycrystalline material.

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Gypsum

Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate, with the chemical formula CaSO4·2H2O.

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Homogeneity and heterogeneity

Homogeneity and heterogeneity are concepts often used in the sciences and statistics relating to the uniformity in a substance or organism.

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Icosahedral twins

An icosahedral twin is a nanostructure appearing for atomic clusters.

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Macle

Macle is a term used in crystallography.

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Martensite

Martensite, named after the German metallurgist Adolf Martens (1850–1914), most commonly refers to a very hard form of steel crystalline structure, but it can also refer to any crystal structure that is formed by diffusionless transformation.

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Metamorphism

Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change).

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Metazeunerite

Metazeunerite is an arsenate mineral with a chemical formula of Cu(UO2)2(AsO4)2·8H2O.

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Microcline

Microcline (KAlSi3O8) is an important igneous rock-forming tectosilicate mineral.

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Nickel titanium

Nickel titanium, also known as Nitinol (part of shape memory alloy), is a metal alloy of nickel and titanium, where the two elements are present in roughly equal atomic percentages e.g. Nitinol 55, Nitinol 60.

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Octahedron

In geometry, an octahedron (plural: octahedra) is a polyhedron with eight faces, twelve edges, and six vertices.

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Orogeny

An orogeny is an event that leads to a large structural deformation of the Earth's lithosphere (crust and uppermost mantle) due to the interaction between plate tectonics.

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Orthoclase

Orthoclase, or orthoclase feldspar (endmember formula KAlSi3O8), is an important tectosilicate mineral which forms igneous rock.

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Plagioclase

Plagioclase is a series of tectosilicate (framework silicate) minerals within the feldspar group.

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Pyrite

The mineral pyrite, or iron pyrite, also known as fool's gold, is an iron sulfide with the chemical formula FeS2 (iron(II) disulfide).

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Quartz

Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.

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Quenching

In materials science, quenching is the rapid cooling of a workpiece in water, oil or air to obtain certain material properties.

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Rutile

Rutile is a mineral composed primarily of titanium dioxide (TiO2).

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Shock hardening

Shock hardening is a process used to strengthen metals and alloys, wherein a shock wave produces atomic-scale defects in the material's crystalline structure.

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Spinel

Spinel is the magnesium aluminium member of the larger spinel group of minerals.

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Stacking-fault energy

The stacking-fault energy (SFE) is a materials property on a very small scale.

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Staurolite

Staurolite is a red brown to black, mostly opaque, nesosilicate mineral with a white streak.

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Steel

Steel is an alloy of iron and carbon and other elements.

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Tin cry

A tin cry is the characteristic sound heard when a bar of tin is bent.

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Work hardening

Work hardening, also known as strain hardening, is the strengthening of a metal or polymer by plastic deformation.

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X-ray crystallography

X-ray crystallography is a technique used for determining the atomic and molecular structure of a crystal, in which the crystalline atoms cause a beam of incident X-rays to diffract into many specific directions.

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X-ray scattering techniques

X-ray scattering techniques are a family of non-destructive analytical techniques which reveal information about the crystal structure, chemical composition, and physical properties of materials and thin films.

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Redirects here:

Composition Surface, Composition surface, Contact Twin, Contact twin, Crystal twin, Cyclic Twin, Cyclic twin, Multiple Twin, Multiple twin, Parallel Growth, Parallel growth, Penetration Twin, Penetration twin, Polysynthetic Twin, Polysynthetic Twinning, Polysynthetic twin, Repeated Twin, Repeated twin, Twin boundary, Twin crystals, Twin formation, Twinned crystal, Twinning (crystallography).

References

[1] https://en.wikipedia.org/wiki/Crystal_twinning

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