wollastonite Meaning, Definition & Usage

  1. noun a white or greyish mineral typically found in metamorphic limestone; a silicate of calcium

WordNet

Wol"las*ton*ite noun
Etymology
After Dr. W. H. Wollaston, an English chemist, who died in 1828.
Definitions
  1. (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.

Webster 1913