rensselaerite

from The Century Dictionary.

• noun A variety of massive talc or steatite. It has a fine compact texture, and is worked in the lathe into inkstands and other articles.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Min.) A soft, compact variety of talc,, being an altered pyroxene. It is often worked in a lathe into inkstands and other articles.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun mineralogy A soft, compact variety of talc, being an altered pyroxene, sometimes worked in a lathe into inkstands and other articles.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a kind of soft talc; sometimes used as wood filler