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. 1906 Excerpt: ...0.28, S03 10.46, CI 0.47 = 99.57. Crystal Form.--Dodecahedrons and sometimes cubes, with imperfect cleavage parallel to (110), in microscopic crystals in a mixture of other minerals called lapis lazuli. Color.--Various tones of blue; azure, purplish, greenish. Inclusions.--Lazurite is intimately associated with ...
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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. 1906 Excerpt: ...0.28, S03 10.46, CI 0.47 = 99.57. Crystal Form.--Dodecahedrons and sometimes cubes, with imperfect cleavage parallel to (110), in microscopic crystals in a mixture of other minerals called lapis lazuli. Color.--Various tones of blue; azure, purplish, greenish. Inclusions.--Lazurite is intimately associated with microscopic crystals of diopside free from iron, a colorless amphibole (koksharovite), muscovite, calcite, pyrite, and in some instances a small amount of scapolite, lime-soda-feldspar, orthoclase, apatite, titanite, zircon, and an undetermined mineral which is optically positive, and is probably uniaxial. Modes of Occurrence.--Lapis lazuli occurs in limestone in connection with granitic rock in such a manner as to appear to be a result of contact metamorphism. NEPHELITE GROUP. /m 3 fmXaAlSiO, Composition: Nephelite-Tj, KAl(SiO, ), Sodium-nephelite, arti., NaAlSiO, Kaliophilite, KAlSiO, Eucryptite, LiAlSiO Hexagonal. (?) Pyramidal. Axis c =0.8389. Nephelite. Cleavage: distinct parallel to (1010), imperfect parallel to (0001) in nephelite. Perfect parallel to (0001) in kaliophilite; also present in eucryptite. Fracture: subconchoidal in nephelite. Brittle. H. =5.5-6 in nephelite, 6 in kaliophilite. Sp. gr. = 2.60-2.65 in nephelite; 2.493-2.602 in kaliophilite; 2.667 in eucryptite. Optical Properties: uniaxial, optically negative. Double refraction low; in nephelite wy = 1.5416, tr =1.5376. Mte. Somma (Wolff). wy = 1.5469, ey = 1.5422. Arkansas (Penfield). oi- =.004-.005. Color: colorless, white and yellowish, greenish to bluish gray; also browns and reds in nephelite. Luster: vitreous to greasy. NEPHELITE (eleolite). Chemical Composition.--Nephelite in all cases contains potassium in addition to sodium, but in varying proportions, from one ...
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Add this copy of Rock Minerals, Their Chemical and Physical Characters to cart. $25.72, new condition, Sold by Ingram Customer Returns Center rated 5.0 out of 5 stars, ships from NV, USA, published 2022 by Legare Street Press.
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Add this copy of Rock Minerals, Their Chemical and Physical Characters to cart. $126.13, new condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2022 by Legare Street Press.
