1887H.C. Lewis inPapers on the Diamond (1897) 50There appears to be no named rock-type having at once the composition and structure of the Kimberley rock...It is now proposed to name the rock Kimberlite...Kimberlite is a rock sui generis, dissimilar to any other known species.
1920F.C. CornellGlamour of Prospecting 37He had just returned from a trip south to the Gibeon district, and he showed me some samples of excellent ‘blue ground’ — Kimberlite — he had found there.
1931G. BeetGrand Old Days 97For the exploitation of the kimberlite pipes, or craters, elaborate methods of open-cast and underground mining have been evolved in the past fifty years.
1968S. TolanskyStrategic Diamond 27The diamond..has usually been brought to the surface region encased in a rock called ‘blue ground’ (from its colour) or alternatively called ‘kimberlite’.
1973A. HockingDiamonds 5Volcanic diamond-bearing kimberlite shoots to the surface, cools to form the pipe. The elements erode exposed blue ground, thus scattering the diamonds it contains.
1976A.R. WillcoxSn Land 219The soft substance in which the first in situ diamonds were found (later called Kimberlite) was known as the ‘yellow gravel’. Below it was the hard ‘blue ground’. This was actually the same material in unweathered form.
1984A. WannenburghNatural Wonder of Sn Afr. 157Kimberlite pipe, a cylindrical mass of rock formed when magma drilled from the interior of the earth to the surface by gas explosions cooled together with rock fragments plucked from the formations through which it passed.
1985A.J.A. Janse inGlover & HarrisKimberlite Occurrence & Origin 29Kimberlites are rare rocks because their surface expressions are very small in extent, but they are widely spread theoughout all continents.
1993Business Day 23 Nov. 7UK company Reunion Mining has found two clusters of kimberlite near the shores of Lake Kariba.
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