Wollastonite

[wulәstәnait]

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

伯特校對--From WordNet

(n.) A silicate of lime of a white to gray, red, or yellow color, occurring generally in cleavable masses, rarely in tabular crystals; tabular spar.

校對:尼古拉斯