Tephroite

Tephroite

Mineral
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Tephroite

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Description:
Tephroite is a non-metallic manganese silicate mineral with the formula, Mn<sub>2</sub>SiO<sub>4</sub>.

It was first described for an occurrence at the Sterling Hill Mine and Franklin, New Jersey, USA. It occurs in iron-manganese ore deposits and their related skarns. It also occurs in metamorphosed manganese-rich sediments. It occurs in association with: zincite, willemite, franklinite, rhodonite, jacobsite, diopside, gageite, bustamite, manganocalcite, glaucochroite, calcite, banalsite and alleghanyite. It can also be found in England and Sweden.

Tephroite has a hardness of 6 and a specific gravity of approximately 4.1, which is heavy for non-metallic minerals. Its name comes from the Greek tephros, "ash gray", for its color. It can also be found olive-green, greenish-blue, pink, or brown.

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