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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Chloritoid-Chloritoid
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
Chloritoid784
Chloritoid784
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