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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Schorl-Schorl
Schorl
Chemical
Formula
 (Ca,K,Na,[])(Al,Fe,Li,Mg,Mn)3(Al,Cr, Fe,V)6(BO3)3(Si,Al,B)6O18(OH,F)4[1][2]
Species
 Silicates
Crystal
System
 Trigonal
Mohs
Scale
 7
Specific
Gravity
 3.06
Color
 Most commonly black, but can range from brown, Purple, green, pink, or in a dual-colored pink and green.
Streak
 White
Luster
 Vitreous, Resinous
Refractive
Index
 n = 1.660 - 1.672 n = 1.635 - 1.650
Diaphaneity
 Translucent, Opaque
Cleavage
 Poor/IndistinctVery poor on ,
Fracture
 Irregular/Uneven, Sub-Conchoidal
Crystal Habit：Parallel and elongated. Acicular prisms, sometimes radiating. Massive. Scattered grains (in granite).
Geological Setting：In granites and granitic pegmatites, high temperature hydrothermal veins, metamorphic rocks.
Schorl1746
Schorl1746
Schorl1743
Schorl1743

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