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adamant Africa aggregate appears approximating atoms average Beers blue ground Bultfontein Bultfontein crystal carats carbon cleavage coigns colour colourless components conformably contour crystal diamond crystallisation cube face cubical frame Diamant diamond crystal dodecahe dodecahedral dodecahedroid dral dron duplex tetrahedron Dutoitspan eclogite edges enclosed encrustation Fersmann and Goldschmidt fissures flakes fluorite fontein foreign mineral fosses fracture fragment Geology gives grey diamond Griqualand West growth hailstone diamond hard hemitropic rotation hypothesis inclusions irregular crystal Kimberley laminated large crystals latter lump macle magma magnetite Micro-photo mines mond nearly occur octahe octahedral octahedron faces parallel phosphorescent plane plastic crystal PLATE postage precious stones pyramidal bosses rhombic dodecahedron rock rounded seam shown in Fig shows shrinkage simple crystal sketch solution currents species specific gravity specimen Spinel Stewartite striae striated striations structure surface tabular temperature tetrahe tetrahedral tetrahedron thickness thin tint tracery triakisoctahedron trigons twin Wesselton yellow zircon