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Diameter, mm (1mm - 0,039inch)

Brookite mineral - You can buy these samples

Brookite is a mineral whose composition is similar to that of other minerals: anatase and rutile. When the temperature rises above 750 degrees Celsius, brookite turns into rutile.

You can see brookite stone for sale and buy it in the Minerals of Russia online store.

Physical properties of Brookite

Category Oxide minerals
(repeating unit)
Strunz classification 4.DD.10 (10 ed)
4/D.15-10 (8 ed)
Dana classification
Crystal system Orthorhombic
Crystal class Dipyramidal (mmm)
H-M symbol: (2/m 2/m 2/m)
Space group Pbca
Unit cell a = 5.4558 Å,
b = 9.1819 Å,
c = 5.1429 Å; Z = 8
Formula mass 79.88 g/mol
Color Deep red, reddish brown, yellowish brown, brown, or black
Crystal habit Tabular and striated, pyramidal or pseudohexagonal
Twinning On {120}, uncertain
Cleavage Poor on {120}, in traces on {001}
Fracture Subconchoidal to irregular
Tenacity Brittle
Mohs scale hardness 5+12 to 6
Luster Submetallic
Streak White, greyish or yellowish
Diaphaneity Opaque to translucent
Specific gravity 4.08 to 4.18
Optical properties Biaxial (+)
Refractive index nα = 2.583 nβ = 2.584 nγ = 2.700
Birefringence δ = 0.117
Pleochroism Very weak, yellowish, reddish, orange to brown
2V angle Calculated: 12° to 20°
Dispersion 0.131 (compare to diamond at 0.044)
Ultraviolet fluorescence Non-fluorescent
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