talc slate
滑石板岩



Talc \Talc\, n. [F. talc; cf. Sp. & It. talco, LL. talcus; all
fr. Ar. talq.] (Min.)
A soft mineral of a soapy feel and a greenish, whitish, or
grayish color, usually occurring in foliated masses. It is
hydrous silicate of magnesia. {Steatite}, or {soapstone}, is
a compact granular variety.

{Indurated talc}, an impure, slaty talc, with a nearly
compact texture, and greater hardness than common talc; --
called also {talc slate}.