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ophiolite

oph·i·o·lite [ óffee ə lt, ṓfee ə lt ]


noun 
Definition:
 
rock rich in iron and magnesium: any igneous and metamorphic rock that was formed from deep-sea sediment. Ophiolites are rich in iron and magnesium.

[Mid-19th century. < Greek ophis "snake" + -lite; from its snaky texture]
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