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aggregates apophyllite appears atoms average blue ground broken Bult Bultfontein Bultfontein crystal calcite carats carbon cement Chapter cleavage coigns colour colourless component contour corners crystal diamond crystallisation cube face cubical diamond crystal diopside dodecahe dodecahedroid dron duplex Dutoitspan eclogite edges enclosed encrustation flakes flat fontein foreign mineral fosses fracture fragments frame garnet gems geometrical graphite grey diamond Griqualand West growth hailstone diamond hard ilmenite inclusion intergrowth irregular Jagersfontein Kimberley Koffyfontein laminated large crystals lump macle Micro-photo mines mond nearly nodules occur octahe octahedral octahedron faces Orange Free parallel Parry & Falck phosphorescent pieces plane plastic crystal PLATE pyrites rhombic dodecahedron rock rotation rounded seam shapeless shell shows simple crystal ſº sort specimen splendent Stewartite stones striae striation surface Tabular Crystal temperature tetrahedral tetrahedron tetrahexahedron thick thin tint tracery triakisoctahedron trigons truncation twin Vaal River Wesselton yellow zircon