Ancient Mineralogy; Or, an Inquiry Respecting Mineral Substances

Ancient Mineralogy; Or, an Inquiry Respecting Mineral Substances

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1859 edition. Excerpt: ...(crrpoyyvXr)), and the moist (vypa). The (rxicrrrj may be rightly denominated fibrous, since he says it greatly resembled a certain stone, which might be distinguished from it, however, as possessing no astringent taste; and this stone, we afterward discover, was amianthus.5 This comparison, altogether unsuitable if we suppose aTvirrYipia (jxigtyi to be sulphate of iron, is perfectly just as applied to what has been in modern times called fibrous alum, which is " composed of capillary crystals or fibres, white, silky, parallel to each other/'1 while "the fibres of amianthus are usually straight, almost always parallel, have in most cases a silky lustre, and their color white."2 1 Dioscor., v., 123. 2 H. N., xxxv., 52. 3 Cleav. Min., p. 227. Vide Mill, in Celsum, lib. iv., c. 18. 5 Cleav. Min., p. 229. 1 Plin., H. N., xxxv., 52. 2 Cleav. Min., p. 227. 3 Kirwan's Min., ii., 13. Dioscor., v., 123. 6 Dioscor., v., 156. In the island Milo are found, mingled with fibrous gypsum in volcanic rocks, fine specimens of what till lately was thought fibrous alum,3 but which appears upon analysis to be a sulphate of alumina containing accidental portions of potash, soda-alum, sulphates of magnesia, iron, and copper.4 This island is mentioned very particularly by Dioscorides as a locality of oTUTTrrjpta, and Pliny observes that the best alumen of a certain kind was that called Melinum, from the island Melos,5 having before said of the substance generally that, after the Egyptian, the most approved was found in Melos. There can be little doubt, therefore, that the alumen of the ancients comprehended at least this sulphate of alumina, or rather that this is the substance generally meant by the words jTV7TTr)pia and alumen; for the islands of more

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  • Paperback | 50 pages
  • 189 x 246 x 3mm | 109g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236513460
  • 9781236513465