Mineral - Brookite
Brookite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
TiO₂
Unit Cell
a=5.46 b=9.18 c=5.14 Z=8
Physical Properties
Hardness
5.5 - 6
Streak
white
Density
Heavy (3,5-6)
Cleavage
Indistinct after {120}
Fracture
uneven
Tenacity
Brittle
Optical Properties
Color
brownredyellow
Birefringence
0.117
Luster
Vitreous,
Adamantine
Transparency
translucent,
transparent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
orthorhombic
Point Group
orthorhombic-dipyramidal - 2/m 2/m 2/m
Space Group
Pbca (61)
Habit
dipyramidal, prismatic, tabular
Formation
hydrothermal, Pegamtite
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Brookite
Composition
Elements
Mass
TiO₂
98.59
Fe₂O₃
1.41
Wales (Palache et al. 1952)