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Anatase

Anatase is a metastable mineral form of titanium dioxide (TiO2) with a tetragonal crystal structure. Although colorless or white when pure, anatase in nature is usually a black solid due to impurities. Three other polymorphs (or mineral forms) of titanium dioxide are known to occur naturally: brookite, akaogiite, and rutile, with rutile being the most…

Crystal habit, Overview & Nomenclature

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Birefringence
δ = 0.073
Category
Oxide minerals
Cleavage
Perfect on and
Color
Black, reddish to yellowish brown, dark blue, gray
Crystal class
Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m)
Crystal habit
Pyramidal (crystals are shaped like pyramids), tabular (form dimensions are thin in one direction).

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Overview

Nomenclature

Crystal habit

Synthetic anatase

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Anatase

Nodes58
Edges57
Triples63
Avg. degree1.97
Density0.034483
Components1

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Anatase

Top relations

related to Crystal habit · 15
Anatase → Alps, Binnenthal, Brig, Crystals, Dauphiné, France, Le Bourg-d'Oisans, Similar, Such, Switzerland, The, Their, They, Two, Valais
related to Nomenclature · 12
Anatase → Ancient Greek, Another, Dauphiné, French, Horace Bénédict, It, Jean-Claude Delamétherie, Le Bourg-d'Oisans, Other, René Just Haüy, Saussure, The
related to Synthetic anatase · 5
Anatase → Crystalline, Due, Often, This, TiCl4
is a · 2
Anatase → metastable mineral form of titanium dioxide, most thermodynamically stable surface and thus the most widely exposed facet in natural and synthetic anatase.Crystals of the second type have numerous pyramidal faces developed
Birefringence · 1
Anatase → δ = 0.073
Category · 1
Anatase → Oxide minerals
Cleavage · 1
Anatase → Perfect on and
Color · 1
Anatase → Black, reddish to yellowish brown, dark blue, gray
Crystal class · 1
Anatase → Ditetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m)
Crystal habit · 1
Anatase → Pyramidal (crystals are shaped like pyramids), tabular (form dimensions are thin in one direction).

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Important terminology

rutile crystals titanium habit crystal dioxide temperatures mineral form tio2 tetragonal common metastable due luster black minerals often surface although

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
AnataseBirefringenceδ = 0.0731.00infobox
AnataseCategoryOxide minerals1.00infobox
AnataseCleavagePerfect on and1.00infobox
AnataseColorBlack, reddish to yellowish brown, dark blue, gray1.00infobox
AnataseCrystal classDitetragonal dipyramidal (4/mmm) H-M symbol: (4/m 2/m 2/m)1.00infobox
AnataseCrystal habitPyramidal (crystals are shaped like pyramids), tabular (form dimensions are thin in one direction).1.00infobox
AnataseCrystal systemTetragonal1.00infobox
AnataseDiaphaneityTransparent to nearly opaque1.00infobox
AnataseFormulaTiO21.00infobox
AnataseFormula mass79.88 g/mol1.00infobox
AnataseFractureSubconchoidal1.00infobox
AnataseIMA symbolAnt1.00infobox
AnataseLusterAdamantine to splendent, metallic1.00infobox
AnataseMohs scale hardness5.5–61.00infobox
AnataseOptical propertiesUniaxial (−), anomalously biaxial in deeply colored crystals1.00infobox
AnatasePleochroismWeak1.00infobox
AnataseRefractive indexnω = 2.561, nε = 2.4881.00infobox
AnataseSpace groupI41/amd1.00infobox
AnataseSpecific gravity3.79–3.971.00infobox
AnataseStreakPale yellowish white1.00infobox
AnataseStrunz classification4.DD.051.00infobox
AnataseTenacityBrittle1.00infobox
AnataseTwinningRare on {112}1.00infobox
AnataseUnit cella = 3.7845, c = 9.5143 [Å]; Z = 41.00infobox
Anataseis ametastable mineral form of titanium dioxide0.90text
Anataseis amost thermodynamically stable surface and thus the most widely exposed facet in natural and synthetic anatase.Crystals of the second type have numerous pyramidal faces developed0.90text

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