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]
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