For example, the large olivine grain just left of center is about 10 mm in length. Cross sections of serpentine plates that look fibrous in thin section. Raw Asbestos (Chrysotile) from Arizona. Background alteration: Alteration has pervasively affected the entire rock and is not primarily bound to veins or foliation planes. However, the chrysotile minerals are more likely to form serpentine asbestos, while antigorite and lizardite form cryptocrystalline masses sometimes with a lamellar or micaceous character. Some olivines are turbid in thin section due to the presence of minute inclusions of chromian spinel, pentlandite, and others (Fig. Chrysotile Antigorite and chrysotile side by side Serpentine in serpentinite from the Josephine ophiolite Serpentine in kimberlite from Barkly West, South Africa. Chrysotile and talc samples were ground and deposited on silver membrane filters. Information in this section, for all sites, represents field notes taken aboard ship. Besides for the main members of Antigorite and Chrysotile, a distinction is not usually made between the individual members except under scientific study and classification.Antigorite usually represents the more solid forms, and Chrysotile usually represents the fibrous forms, especially asbestos. Relief: Low-Moderate positive Habit/Form: Fibrous serpentine is typically chrysotile and it commonly forms veins with fibers across the width or matted masses. ATR–IR spectroscopy of antigorite, chrysotile, and lizardite in samples from the Mt. Serpentine in thin section. Serpentine in Thin Section. Chrysotile has a refractive index of about 1.550, while that of amosite is 1.692, and crocidolite has the highest, with a value of 1.695. Serpentine #2 thin section (hFOV 2mm) GET 360° LIVE INTERACTION. Location: Pereval Marble Quarry, Slyudyanka (Sludyanka), Lake Baikal area, Irkutskaya Oblast', Prebaikalia (Pribaikal'e), Eastern-Siberian Region, Russia. The samples range from roughly 3%-8% in Fe 2 O 3 and the oxidized material can be seen in some of the thin section samples. In serpentinite veins of ultrabasic rocks, long and thin chrysotile fibers coexist frequently with shorter but thicker polygonal fibers of serpentine. This is most evident with chrysotile that exhibits an inherent, well-defined unit fiber. The main serpentine group minerals are antigorite chrysotile and lizardite. Antigorite with minor amounts of chrysotile (Yu-Yen Shi stone), Liaoning Province, Manchuria- Such long, thin fibers would likewise be missed at the screening magnification that we use. Chrysotile - Mg 3 Si 2 O 5 (OH) 4 Lizardite - Mg 3 (Si 2 O 5)(OH) 4 Their differences are minor and almost indistinguishable in hand samples. Other clay minerals and metal oxides opaque in thin section are also formed by breakdown reactions and are evident in the thin section. The finely fibrous variety of Tremolite is used for industrial asbestos.Although fibrous Serpentine is the main source of asbestos, Tremolite and Actinolite are also asbestos producers. Some of these minerals, particularly amosite, crocidolite, and chrysotile, can be spun and woven into textiles, and to some extent value depends upon length of fibre. Actinolite Properties. Extinction is a term used in optical mineralogy and petrology, which describes when cross-polarized light dims, as viewed through a thin section of a mineral in a petrographic microscope.Isotropic minerals, opaque (metallic) minerals, and amorphous materials (glass) do not allow light transmission under cross-polarized light (i.e.
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