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  Home  >>  Mineral Encyclopedia  >>  Mineral Photos  >>  Tephroite-Tephroite
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.
Tephroite1936
Tephroite1936

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