Mineral - Brucite
Brucite
Chemical Properties
Mineral Class
Oxides and Hydrxides
Toxicity
none
Formula
Mg(OH)₂
Unit Cell
a=3.14 c=4.77 Z=1
Physical Properties
Hardness
2.5
Streak
white
Density
Normal (2-3,5)
Cleavage
Perfect after {0001}
Fracture
fibrous
Tenacity
Supple
Optical Properties
Color
whitebrownyellowblue
Birefringence
0.020
Luster
Vitreous,
Pearly
Transparency
translucent,
transparent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
trigonal
Point Group
ditrigonal-scalenohedral - 3 m
Space Group
P 3 m1 (164)
Habit
crusty, spherical, massive, acicular, kidney-shaped, tabular, grape-shaped
Formation
Metamorphism
Paragenesis
Twinning
Rarity
Common
Synonyms
Brucite
Composition
Elements
Mass
Fe₂O₃
0.10
MnO
0.84
MgO
68.29
H₂O
30.74
USA (Palache et al. 1952)
Groups and Members
Brucite-Group