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4Â¥2009-04-17 18:27:18
isotope8512
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xinmeng8803(½ð±Ò+1,VIP+0):лл»ý¼«²ÎÓ룡 6-6 11:32
xinmeng8803(½ð±Ò+1,VIP+0):лл»ý¼«²ÎÓ룡 6-6 11:32
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Ultramafic (also referred to as ultrabasic) rocks are igneous and meta-igneous rocks with very low silica content (less than 45%), generally >18% MgO, high FeO, low potassium, and are composed of usually greater than 90% mafic minerals (dark colored, high magnesium and iron content). ... en.wikipedia.org/wiki/Ultramafic |
2Â¥2009-04-16 20:47:09
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3Â¥2009-04-17 09:44:19














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