kimberlite

[kim-ber-lahyt]
noun
Petrology. a variety of micaceous peridotite, low in silica content and high in magnesium content, in which diamonds are formed.

Origin:
1885–90; named after Kimberley, South Africa; see -ite1

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Collins
World English Dictionary
kimberlite (ˈkɪmbəˌlaɪt)
 
n
an intrusive igneous rock generated at great depth in the earth's mantle and consisting largely of olivine and phlogopite. It often contains diamonds
 
[C19: from Kimberley + -ite1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
kimberlite   (kĭm'bər-līt')  Pronunciation Key 
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.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The alluvial terraces are exhausted and the future lies in the underlying kimberlite rock.
Because the kimberlite is much softer than the surrounding granite, there were deeper depressions in the areas with kimberlite.
Diamonds, for instance, are found in rocks known as kimberlite.
In contrast to alluvial diamonds, there are kimberlite diamond deposits.
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