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A rare, blue-tinged, coarse-grained intrusive igneous rock sometimes containing diamonds, found especially in South Africa and Siberia.Also called blue ground
- ‘Lamproite is also a mantle-derived ultramafic rock that differs from kimberlite in bulk chemistry, being richer in silicon and poorer in aluminum and iron.’
- ‘Aggressive exploration has confirmed the presence of diamond-bearing kimberlite pipes scattered over a considerable area extending into adjoining Alberta, Saskatchewan, and Nunavut.’
- ‘It was suggested by some readers that the matrix for the featured diamond crystal from the Jagersfontein mine looked suspiciously like the rock eclogite rather than kimberlite.’
- ‘So Rankin Inlet wasn't surprised when prospectors exploring the area recently announced a promising find of kimberlite, a volcanic rock that often contains diamonds, 20 km from town.’
- ‘Diamond is obtained from volcanic pipes composed of kimberlite or lamproite, rocks that are found only in cratons, very old stable areas of the Earth's crust.’
Late 19th century: from Kimberley + -ite.
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