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Dominant species
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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.
Schorl1909
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