A System of Mineralogy; Comprising the Most Recent Discoveries, Including Full Descriptions of Species and Their Localities, Chemical Analyses and Formulas, Tables for the Determination of Minerals, with a Treatise on Volume 1-2

A System of Mineralogy; Comprising the Most Recent Discoveries, Including Full Descriptions of Species and Their Localities, Chemical Analyses and Formulas, Tables for the Determination of Minerals, with a Treatise on Volume 1-2

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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. 1854 edition. Excerpt: ...crystals. Also stalactitic and mammillary forms. Often massive, either impalpable, or coarse granular. Sometimes coarsely tabular and reticulated. H.=7. G.=2-5--2-8; 2-6413--2-6541, Beudant; 26701, Hauy. Lustre vitreous, sometimes inclining to resinous; splendent--nearly dull. Colorless, when pure; often various shades of yellow, red, brown, green, blue, black. Streak white, of pure varieties; if impure, often the same as the color, but much paler. Transparent--opaque. Fracture perfect conchoidal--subconchoidal. Tough--brittle--friable. Composition.--Pare silica in the insoluble state, that is, not taken up by a potash solution. Impure varieties contain variable quantities of oxyd of iron, alumina, oxyd of manganese, nickel, fec. B.B. alone undergoes no change, but with soda, fuses readily with effervescence to a transparent glass. The varieties arise either from crystallization, mode of formation, or impurities; and are naturally distributed into three series. (1st), presenting the bright glassy lustre of broken quartz crystal; (2d), presenting the glistening subvitreous or waxy lustre, and translucency, or subtransparency of Chalcedony; (3d), with the nearly dull lustre, dull colors, and opacity of Jasper. I. The vitreous varieties. Rock crystal includes pure crystals of quartz. This stone, when out for jewelry, is called "white stone." An asteriated variety contains whitish impurities or opacity arranged along the diametral planes. Amethyst is a clear purple or bluish-violet variety of quartz crystal. The color is supposed to be due to a small percentage of oxyd of manganese. But Heintz. in an analysis of a Brazilian specimen, obtained, besides silica, 0-0187 oxyd of iron, 0-6236 lime, 0-0133 magnesia, and 0-0418 soda; and he considers...show more

Product details

  • Paperback | 330 pages
  • 189 x 246 x 18mm | 590g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236606965
  • 9781236606969