What is the meaning of Tephroite?

(n.) A silicate of manganese of an ash-gray color.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). tephroite. Retrieved September 30, 2026, from http://smartdefine.org/tephroite/definitions/2071243
ChicagoWebster's. 2011. "tephroite" http://smartdefine.org/tephroite/definitions/2071243 (accessed September 30, 2026).
HarvardWebster's 2011, tephroite, Smart Define, viewed 30 September, 2026, <http://smartdefine.org/tephroite/definitions/2071243>.
MLAWebster's. "tephroite" 28 May 2011. Web. 30 September 2026. <http://smartdefine.org/tephroite/definitions/2071243>