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wollastonite
From The Collaborative International Dictionary of English v.0.48:
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. [1913 Webster]
