Mineral - Chloritoid
Chloritoid
Chemical Properties
Mineral Class
Silicates
Toxicity
none
Formula
(Fe²⁺,Mg,Mn²⁺)Al₂(SiO₄)O(OH)₂
Unit Cell
Physical Properties
Hardness
6.5
Streak
whitegray
Density
Normal (2-3,5)
Cleavage
Fracture
Tenacity
Optical Properties
Color
blackgraygreen
Birefringence
0.010
Luster
Vitreous,
Pearly
Transparency
translucent,
opaque
Pleochroism
Geomineralogical Properties
Crystal System
monoclinic
Point Group
monoclinic-prismatic - 2/m
Space Group
C2/c (15)
Habit
blocky, prismatic, tabular
Formation
Paragenesis
Twinning
Rarity
Rather rare
Synonyms
Chloritoid
Groups and Members
Chloritoid-Group