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Answer for the clue "A white or grayish mineral typically found in metamorphic limestone ", 12 letters:
wollastonite

Alternative clues for the word wollastonite

Word definitions for wollastonite in dictionaries

Wiktionary Word definitions in Wiktionary
n. (context mineralogy English) A grey inosilicate mineral, mostly calcium silicate, calciumsiliconoxygen 3 , found deposited in limestone.

WordNet Word definitions in WordNet
n. a white or grayish mineral typically found in metamorphic limestone; a silicate of calcium

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Wollastonite \Wol"las*ton*ite\, n. [After Dr. W. H. Wollaston, an English chemist, who died in 1828.] (Min.) A silicate of lime of a white to gray, red, or yellow color, occurring generally in cleavable masses, rarely in tabular crystals; tabular spar.

Wikipedia Word definitions in Wikipedia
Wollastonite is a calcium inosilicate mineral ( Ca Si O ) that may contain small amounts of iron , magnesium , and manganese substituting for calcium. It is usually white. It forms when impure limestone or dolostone is subjected to high temperature and ...