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ultrabasic

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ul·tra·ba·sic  (ltr-bsk)
adj.
Containing magnesium and iron and only a very small amount of silica. Used of igneous rock.
ultrabasic [ˌʌltrəˈbeɪsɪk]
adj
(Earth Sciences / Geological Science) (of such igneous rocks as peridotite) containing less than 45 per cent silica
ultrabasic  (ltr-bsk)
Containing magnesium and iron and only a very small amount of silica. Used of igneous rock, and often used interchangeably with ultramafic. Peridotite is an ultrabasic rock.
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Sheffield Resources will explore for nickel on its new Golden Loon project over a 7 kilometre by 2 kilometre layered ultrabasic intrusive located 4 kilometres to the west of Little Fort, British Columbia.
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Southern Dyke - an extremely weathered ultrabasic rock identified along with the recovery of chrome spinels and high interest clinopyroxenes have been recovered.
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