rensselaerite

Etymology
After, founder in 1824 of

Noun

 * 1)  A soft, compact variety of talc, being an altered pyroxene, sometimes worked in a lathe into inkstands and other articles, found in New York and Canada.
 * 2) * 1840, ("Assembly: State of New York, Issue 50", published 1840, digitised 2010).
 * To this I may subjoin Rensselaerite, which frequently occurs in thick, heavy beds in connexion with the above.