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peridotite |
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peridotite (pĕr'ēdō`tīt): see olivine olivine (ŏlĭv`ēn), an iron-magnesium silicate mineral, (Mg,Fe)2SiO4 ..... Click the link for more information. . peridotiteCoarse-grained, heavy, igneous rock that contains at least 10% olivine, other iron- and magnesium-rich minerals (generally pyroxenes), and not more than 10% feldspar. Peridotite is the ultimate source of all chromium ore and naturally occurring diamonds, and of nearly all chrysotile asbestos. Nearly all peridotite is more or less altered to serpentine; in warm, humid climates peridotite and serpentine have weathered to soils and related deposits that, though now worked on a relatively small scale, are potential sources of iron, nickel, cobalt, and chromium. peridotite [pə′rid·ə‚tīt] (petrology) A dark-colored, ultrabasic phaneritic igneous rock composed largely of olivine, with smaller amounts of pyroxene or hornblende. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Bonatti studied peridotite rocks collected by dredges, drill ships and deep submersibles. Devine says the team discovered pieces of peridotite -- the primary material of the earth's mantle -- up to the size of footballs of Lake Nyos. The magnetic signature of the peridotite suggests a body that is triangular in shape with dimensions roughly 350 meters by 400 meters by 400 meters in size. |
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