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Diamond Mines of Griqualand West
Typical diamond shapes
Map of South West Africa Namibia
21 other sections not shown
age estimate alluvial diamonds America amongst Angola Australia Brazil carats carbon cluster composition Congo craton continent continental Country Locality Cretaceous crust crystals deﬁnition denudation depth diamond content diamond crystallisation diamond deposits diamond stability ﬁeld diamondiferous kimberlites diamonds diapir discovery district Earth eastern eclogitic episode erupted evidence feet ﬁnd ﬁrst ﬁssures ﬁve ﬂood ﬂoor ﬂow formed fracture zones gemstones geological geologists geoscientists Ghana Gondwanaland gravels hot spot igneous indications Ivory Coast Kaapvaal craton Kenieba Kimberley kimberlite activity kimberlite intrusions kimberlite magma kimberlite occurrences kimberlite pipes kimberlites and diamonds known lamproitic lineament liquid magma mantle melt mid-ocean ridge miles million years ago minerals mining mountains nodules north-west ocean floor Olonek peridotitic plate plateau Precambrian probably province radiometrically dated region rifting rock scientiﬁc Sefadu shield Siberia Sierra Leone signiﬁcance South Africa southern speciﬁc suggested surface tectonic true kimberlite Vaal River valley volcanic West African yielded zones of weakness