Tephroite
| Tephroite | ||
|---|---|---|
2V angle Measured: 60° to 70°, Calculated: 78° | | |
| References | [2][3][4] | |
Tephroite is the
nesosilicate minerals with the formula Mn2SiO4. A solid solution series exists between tephroite and its analogues, the group endmembers fayalite and forsterite
. Divalent iron or magnesium may readily replace manganese in the olivine crystal structure.
It was first described for an occurrence at the
manganocalcite, glaucochroite, calcite, banalsite and alleghanyite.[2] It can also be found in England
and Sweden.
Tephroite has a hardness of 6 and a
Greek tephros, "ash gray", for its color.[4]
It can also be found olive-green, greenish-blue, pink, or brown. Other names for tephroite include mangan olivine and mangan peridot.
References
- S2CID 235729616.
- ^ a b http://rruff.geo.arizona.edu/doclib/hom/tephroite.pdf Handbook of Mineralogy
- ^ a b http://www.mindat.org/min-3913.html Mindat.org
- ^ a b http://webmineral.com/data/Tephroite.shtml Webmineral data
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