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Dominant species
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Humite
Chemical
Formula
(Mg,Fe)7(SiO4)3(F,OH)2.
Species
Silicates
Crystal
System
Orthorhombic
Mohs
Scale
6
Specific
Gravity
3.20-3.32
Color
White, yellow, dark orange, brown
Streak
White
Luster
Vitreous
Refractive
Index
n = 1.607 - 1.643 n = 1.619 - 1.653 n = 1.639 - 1.675
Diaphaneity
Transparent
Cleavage
Poor
Fracture
Uneven to subconchoidal
Humite6161
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