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Brookite

Brookite is the orthorhombic variant of titanium dioxide (TiO2), which occurs in four known natural polymorphic forms (minerals with the same composition but different structure). The other three of these forms are akaogiite (monoclinic), anatase (tetragonal) and rutile (tetragonal). Brookite is rare compared to anatase and rutile and, like these forms…

Measurement, Occurrence and associations & Overview

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Occurrence and associations

Alpine veinsGneissSchistDetrital mineralTitanite
17 related topics

Overview

OrthorhombicTitanium dioxidePolymorphicAkaogiiteMonoclinic
20 related topics

Appearance

StriatedPyramidalHexagonalPrismaticEpitaxial
8 related topics

Physical properties

BrittleFractureCleavageTwinningMohs hardness
8 related topics

Key facts & relationships

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2V angle
Calculated: 12° to 20°
Birefringence
δ = 0.117
Category
Oxide minerals
Cleavage
Poor on {120}, in traces on {001}
Color
Deep red, reddish brown, yellowish brown, brown, or black
Crystal class
Dipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)

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Overview

Unit cell

Structure

Appearance

Optical properties

Physical properties

Occurrence and associations

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Map overview Semantic statistics

Brookite

Nodes74
Edges73
Triples57
Avg. degree1.97
Density0.027027
Components1

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Brookite

Top relations

related to Occurrence and associations · 11
Brookite → Associated, Balochistan, Fron Olau, Gwynedd, In, Kharan, Pakistan, Prenteg, The, Twll Maen Grisial, Wales
related to Physical properties · 4
Brookite → Mohs, The, This, Twinning
related to Appearance · 3
Brookite → Beautiful, It, They
related to External links · 3
Brookite → Archived, Crystal, Wayback MachineJMol
related to Optical properties · 3
Brookite → For, It, Refractive
related to Unit cell · 3
Brookite → Pcab, The, TiO2
related to Structure · 2
Brookite → Each, The
2V angle · 1
Brookite → Calculated: 12° to 20°
Birefringence · 1
Brookite → δ = 0.117
Category · 1
Brookite → Oxide minerals

Important terminology Word statistics

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Important terminology

rutile anatase also structure orthorhombic cell unit minerals tio2 forms crystal brown yellowish compared titanium reddish hardness refractive optical properties

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
Brookite2V angleCalculated: 12° to 20°1.00infobox
BrookiteBirefringenceδ = 0.1171.00infobox
BrookiteCategoryOxide minerals1.00infobox
BrookiteCleavagePoor on {120}, in traces on {001}1.00infobox
BrookiteColorDeep red, reddish brown, yellowish brown, brown, or black1.00infobox
BrookiteCrystal classDipyramidal (mmm) H-M symbol: (2/m 2/m 2/m)1.00infobox
BrookiteCrystal habitTabular and striated, pyramidal or pseudohexagonal1.00infobox
BrookiteCrystal systemOrthorhombic1.00infobox
BrookiteDana classification4.4.5.11.00infobox
BrookiteDiaphaneityOpaque to translucent1.00infobox
BrookiteDispersion0.131 (compare to diamond at 0.044)1.00infobox
BrookiteFormulaTiO21.00infobox
BrookiteFormula mass79.88 g/mol1.00infobox
BrookiteFractureSubconchoidal to irregular1.00infobox
BrookiteLusterSubmetallic1.00infobox
BrookiteMohs scale hardness.mw-parser-output .frac{white-space:nowrap}.mw-parser-output .frac .num,.mw-parser-output .frac .den{font-size:80%;line-height:0;vertical-align:super}.mw-parser-output .frac .de…1.00infobox
BrookiteOptical propertiesBiaxial (+)1.00infobox
BrookitePleochroismVery weak, yellowish, reddish, orange to brown1.00infobox
BrookiteRefractive indexnα = 2.583 nβ = 2.584 nγ = 2.7001.00infobox
BrookiteSpace groupPbca1.00infobox
BrookiteSpecific gravity4.08 to 4.181.00infobox
BrookiteStreakWhite, greyish or yellowish1.00infobox
BrookiteStrunz classification4.DD.10 (10 ed) 4/D.15-10 (8 ed)1.00infobox
BrookiteTenacityBrittle1.00infobox
BrookiteTwinningOn {120}, uncertain1.00infobox
BrookiteUltraviolet fluorescenceNon-fluorescent1.00infobox
BrookiteUnit cella = 5.4558 Å, b = 9.1819 Å, c = 5.1429 Å; Z = 81.00infobox
Brookiteis aorthorhombic variant of titanium dioxide0.90text

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