Descriptive Mineralogy With Especial Reference to the Occurrences And Uses of M
Descriptive Mineralogy With Especial Reference to the Occurrences And Uses of M
Edward Henry Kraus
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Specific gravity 3. 19 to 3. 33. Transparent to translucent. Colorless, white, gray, yellowish, or greenish. May alter to serpentine. Sometimes contains as much as 5% of Fe 2 O 3 . Occurs associated with spinel, augite, and serpentine. It is the result of contact metamorphism on limestone or dolomite. Has been found in the Ural Mts. ; Snarum, Norway; Bolton, Mass. OLIVINE, Chrysolite, Peridot, (Mg, Fe), SiO 4 . Orthorhombic, bipyramidal class, a : b : c = 0. 4657 : i : 0. 5865. Crystals are pri...smatic or thick tabular. Not very common. They are usually comparatively simple. A usual combination consists of the unit and brachyprisms in and s, unit bipyramid o, brachy- and macro-domes d and q, and the brachypinacoid b, figure 116. Such crystals are somewhat chisel-like in devel- opment. There are three twinning laws, ( i ) unit brachyprisms m and s, unit bipyramid o, brachy- and and (3) brachyprism (2a : b : coc). Occurs also in lose, ^rounded, and disseminated grains and granular aggregates.
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