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See Steatite, and Talc.

n which chalk is dug. -- Drawing chalk. See Crayon, n., 1. -- French chalk, steatite or soapstone, a soft magnesian mineral. -- Red chalk, an indurated clayey ocher containing iron, and used by painters and artificers; reddle.

Like grease or oil; smooth; seemingly unctuous to the touch, as is mineral soapstone.

h is made of an artificial slatelike material. -- Slate pencil, a pencil of slate, or of soapstone, used for writing on a slate. -- Slate rocks (Min.), rocks which split into thin laminæ, not necessarily parallel to the stratification; foliated rocks. -- Slate spar (Min.), a variety of calcite of silvery white luste…

is quarried for fireplaces and for coarse utensils. Called also potstone, lard stone, and soapstone.

r, 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.