blue ground

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kimberlite

or blue ground

Dark, heavy, often fragmented igneous rock that may contain diamonds in the rock matrix. Kimberlite is a mica peridotite, an ultrabasic rock type with a complex and often highly altered mineral composition. It occurs in the Kimberley district of South Africa and the Kimberley and Lake Argyle regions of Australia, as well as near Ithaca, N.Y.

blue ground [¦blü ‚grau̇nd]

(geology)

The decomposed peridotite or kimberlite that carries the diamonds in the South African mines.

Strata of the coal measures, consisting principally of beds of hard clay or shale.

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