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rock alum
[rock n.1]
(See alum n. 1 and roche alum.)
1671Phillips s.v. Allum, Called Roch or Rock Allum. 1678R. Russell tr. Geber iv. iv. 246 Glassy or Rock Allom hath a two fold way of Preparation. a1756Mrs. Heywood New Present (1771) 263 A pound of rock-allum, burnt and beat to powder. 1806W. Turton Linnæus' Syst. Nat. VII. 221 Alumen romanum, Rock alum. 1860Piesse Lab. Chem. Wonders 107 The name rock or roche alum indicative of good quality. 1875Encycl. Brit. I. 644/2 The term rock alum, commonly employed in Europe. |