steatite

noun

ste·​a·​tite ˈstē-ə-ˌtīt 

1

: a massive talc having a grayish-green or brown color : soapstone

2

: an electrically insulating porcelain composed largely of steatite

steatitic

ˌstē-ə-ˈti-tik 

adjective

Word History

Etymology

Latin steatitis, a precious stone, from Greek, from steat-, stear

First Known Use

1794, in the meaning defined at sense 1