An Elementary Treatise on Mineralogy; Comprising an Introduction to the Science

An Elementary Treatise on Mineralogy; Comprising an Introduction to the Science

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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. 1844 edition. Excerpt: ...rhombic octahedrons, whose angles are 109 82', and 144; the acute solid angles generally replaced. White and transparent; lustre vitreous. Occurs with Wavellite and chalkolite on quartz at Stenna-gwin in Cornwall, but is an extremely rare mineral. It was discovered by Levy, but examined and named by Dr. Wollaston, who could discover nothing in it but fluoric acid and alumina. AZURITE. LazuKt, W. H. Axurite, 1. Prismatic Azure Spar, M. Klaprothine, Beudant. Feldspntli blue, H. Blue Spar. Lazulus rhorabicua, D. This mineral is a hydrous diphosphate of alumina and magnesia. Taking the analysis by Fuchs, the atoms of acid, including the silica, amount to half the atoms of the bases, showing the mineral to consist of disalts. The oxide of iron and alumina which are united with the silica, as disilicates, Dr. Thomson supposes to be accidental, whence he gives the formula--4Al2Ph]Mg9ih+l Aq. Sp. Gr. 30--3-1. H. = 5 0--CO. Primary form a Right rhombic prism of 121 30', according to Brooke. Lazulite rarely occurs crystallized, being more often granular, or in small fragments, exhibiting various shades of azure blue. It is slightly translucent, brittle, yet nearly as hard as quartz; the fracture is lamellar, and its cleavage is parallel with the planes of the prism, though indistinct. B B, it intumesces a little, and assumes a glassy appearance where the heat has been highest, but does not melt. With borax it yields a clear colorless globule. The second of the above figures represents a superb crystal in the possession of II. J. Brooke, Esq. M on M' 121 3V tor M'one'.... 138 45 Monti 140 30 M or M' on/ 150 45 a on o 91 30 cl or el' 129 10 It occurs in a gangue of quartz, near Vorau in Styria; and in narrow veins traversing clay-slate in the torrent...
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Product details

  • Paperback | 290 pages
  • 189 x 246 x 15mm | 522g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236621697
  • 9781236621696