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Dominant species
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Tephroite
Chemical
Formula
Mn2SiO4
Species
Silicates
Crystal
System
Orthorhombic
Mohs
Scale
6
Specific
Gravity
3.87-4.12
Color
Olive-green, bluish green, gray, °esh-red, reddish brown; pale green in thin section, may be colorless
Streak
Pale gray
Luster
Vitreous, Greasy
Refractive
Index
n = 1.759 n = 1.797 n = 1.860
Diaphaneity
Translucent
Cleavage
Distinct/GoodDistinct on Imperfect on
Fracture
Irregular/Uneven, Conchoidal
Crystal Habit:Crystals typically short, prismatic, to 4 cm, or anhedral, equidimensional. Commonly in disseminated grains, compact, or massive.
Geological Setting:In Fe-Mn ore deposits, skarns, and metamorphosed manganese rich sediments.
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