Min. [Ger. fettstein (Werner 1808), f. fett fat + stein stone.] = ELÆOLITE.
1815. W. Phillips, Outl. Min. Geol. (1818), 32. The fettstein consists of 44 silex, 34 alumine, 4 oxide of iron, a small portion of lime, and 16 parts of soda and potash.
1859. D. Page, Handbk. Geol. Terms, s.v.
