Kimberlite definitions

kĭm'bər-līt'
A variety of peridotite forming pipes in which diamonds and garnets are often found.
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A kind of peridotite which sometimes contains diamonds.
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A type of peridotite consisting of a fine-grained matrix of calcite and olivine and containing phenocrysts of olivine, garnet, and sometimes diamonds. Kimberlites are found in long, vertical volcanic pipes, especially in South Africa.
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(geology) A variety of peridotite containing a high proportion of carbon dioxide; often contains diamonds.
noun
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Origin of kimberlite

After Kimberley a city in central South Africa where several kimberlite pipes mined for large diamonds are found