Volltext Seite (XML)
Muriatic Genus. Fradure prefents delicate, and moftly ftreight and parallel, rarely curved fibres, fometimes clofely compafted. Its fibres flexible. Fragments, long fplintery. Hardnefs from 3 to 4, Sp. gr. before it has abforbed water, is, according to Briflon, from 0,9088 to 2,3x34, and after abforption from 1,5662 to 2,3803. Feels fomewhat greafy. I found a fpecimen of the greyilh white to melt at 162,5, into a greenilh black, perfedly compad glafs. Mr. D’Arcet and Sauflure found it to melt, and cryftallize, at (I prefume) a much lower heat; and at a higher, to run into a greenilh glafs. The fnow-white amianthus, of Tarentaife, was found by Mr. Bergman to contain 64 per ct. lüex, 18,6 aerated magnefia, 6,9 aerated calx, 6 barofelenite, 33 argill, and 1,2 calx of iron. 4 Bergm. 163. The ftone from Suarwick, which he calls af- beftus, but which, from the flexibility of its filaments, I judge to be an amianthus, afforded him 0,64 filex, 0,172 aerated magnefia, 0,139 aerated calx, 0,027 argill, and 0,022 calx of iron. Ibid. 165. That which he caljs afbeftus of Corias, in Afturias, I take alfo to be an amianthus, as hc fays it is very like that of Tarantaife, and refers it to Cronftedt, § 105. 1; in this he found 0,72 filex, 0,129 aerated magnefia, 0,105 aerated calx, 0,033 ar gM> and 0,013 calx of iron. Another from Crete contained 53 per ct. of filex, 28,8 aerated magnefia, 14,3 aerated calx, i argill, and 2 calx of iron. 2 Hence