wollastonite

 
Pronunciation: /ˈwʊləstənʌɪt/

noun

[mass noun]
  • a white or greyish mineral typically occurring in tabular masses in metamorphosed limestone. It is a silicate of calcium and is used as a source of rock wool.

Origin:

early 19th century: from the name of W. H. Wollaston (see Wollaston, William Hyde) + -ite1