Grundteilungsgesetz

Anhang. Bibliographie. Register (Bd. 12 = Schlußbd.)

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Monograph

Identifikator:: 1738045803

URN:: urn:nbn:de:zbw-retromon-113913

Document type:: Monograph

Title:: Grundteilungsgesetz

Place of publication:: [Berlin]

Year of publication:: 1914

Scope:: getr. Pag

Digitisation:: 2020

Collection:: Economics Books

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Document type:: Monograph

Structure type:: Chapter

Title:: Nr 035 A / Grundteilungsgesetz / Vorläufig festgestellter Bericht

Collection:: Economics Books

THE MICAS, ASBESTOS, AND GEMS 161 fibres 2—3 feet long ; it is more resistant to acid, but is weaker than chrysotile asbestos, Anthophyllite asbestos (from a rhombic amphibole) is a brittle variety quarried in Georgia (U.S.A) for use in building tiles. A. M. Bateman (Econ. Geol., xviii, 1923, pp. 663-80) has described an Arizona asbestos due to replacement of thin bands of serpentine which had been formed along earthy layers in a limestone by magmatic water from an adjacent diabase. This ser- pentine was not an’ altered ultra-basic rock. The value of asbestos varies greatly ; in 1925 the average of all grades was about £7 per ton, while the highest quality Was worth about £100 per ton. MoONAZITE Monazite (Ce(LaDi)PO,; sp. gr., 5-2; hardness, 54) is a phosphate of the rare earths cerium, lanthanum, and didy- mium, and yields the thorium oxide used for gas mantles. Monazite occurs in yellow grains as an accessory constituent of gneiss, pegmatite, and many granites. It is obtained from alluvial deposits and mainly from sea beaches in Southern India and Brazil. The Indian is the richer and yields about 8 per cent. of thorium oxide. Owing to the smaller use of gas as an illuminant the price of monazite sand has fallen to about 3d. per Ib. and the production in India from 2000 tons in 1918-19 to an average of 300 tons; the output from Brazil, which was 7000 tons per annum, has stopped. Tur Gems Tue Diamonp—The gems are mostly common materials, such as carbon, alumina, and earthy silicates, crystallized by contact metamorphism, or superheated steam, or acids under pneumatolytic conditions. The diamond is first in scientific and historic interest. It was found to be a crystal- line form of carbon, as its ignition by a burning glass produced only carbon dioxide. The diamond is the hardest known natural substance. Its hardness led to the legend that it 1s indestructible unless treated with goat’s blood. The chief supplies have come from the interior of South Africa, 150 million carats! from Brazil, 15 million carats. from India. Th € metri standard sj Tieunaiof 200 milli 2 since 1913 ; th 0 milligrams = 3 . ; the former carat has been th s 34 grains e accepted

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