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248 GYPSUM FAMILY. It occurs massive, contorted, and reniform. It is feebly glimmering, or dull. i The fracture is small splintery, passing into even and flat conchoidal. The fragments are more or less sharp-edged. It alternates from translucent to translucent on the edges. It scratches calcareous-spar, but is scratched by fluor spar. It is greyish-white in the streak. It is rather difficultly frangible. Specific gravity, 2.850, Klaproth. 2.906, Rose. Constituent Parts. Lime, 41.48 Lime, 42.00 Sulphuric Acid, 56.28 Sulphuric Acid, 56.50 Water, 0 75 Muriate of Soda, 0.25 100.00 Loss, 1.28 .* Rose, in Karsten’s 100.00 Klaproth, Beit. b. iv. s. 233. Geognostic and Geographic Situations. It occurs in beds in the salt-mines of Austria and Salz burg ; and also in the first floetz gypsum, on the eastern foot of the Ilartz mountains. The contorted variety has been hitherto found only in the salt-mines of Wie- liczka, and those near Bochnia in Poland, and there it is imbedded in clay. Observations. The contorted variety, from its resemblance to the convolutions of the intestines, used to be called Pierre de Tripes, and was for some time confounded with Ileavy- epar. Second
