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Dominant species
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Chloritoid
Chemical
Formula
(Fe,Mg,Mn)2Al4Si2O10(OH)4
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
6
Specific
Gravity
3.46-3.80
Color
Dark gray, greenish gray, greenish black
Streak
White, grayish, or very slightly greenish
Luster
Vitreous, Pearly
Refractive
Index
n = 1.713 - 1.730 n = 1.719 - 1.734 n = 1.723 - 1.740
Diaphaneity
Translucent
Cleavage
Perfect perfect, good.
Crystal Habit:Tabular pseudohexagonal crystals; rosettes, commonly coarsely foliated with foliaetypically curved or bent; also massive
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