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Dominant species
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Tremolite
Chemical
Formula
Ca2Mg5Si8O22(OH)2
Species
Silicates
Crystal
System
Monoclinic
Mohs
Scale
5-6
Specific
Gravity
2.99-3.03
Color
White, gray, lavender to pink, light green, light yellow
Streak
White
Luster
Vitreous, Silky
Refractive
Index
n = 1.599 - 1.612 n = 1.613 - 1.626 n = 1.625 - 1.637
Diaphaneity
Transparent, Translucent
Cleavage
Perfecton
Crystal Habit:Elongated prismatic, or flattened crystals; also as fibrous, granular or columnar aggregates
Geological Setting:Contact metamorphism of Ca-Mg siliceous sediments, regional greenschist metamorphism of ultramafic rocks or magnesium carbonate rocks.
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