Diamond: A Descriptive Treatise |
Common terms and phrases
aggregates apophyllite appears approximating atoms average Beers and Kimberley blue ground broken 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 droids dron duplex tetrahedron Dutoitspan eclogite edges enclosed encrustation flakes flat fontein foreign mineral fosses fracture fragments frame garnet gems geometrical grains graphite grey diamond Griqualand West growth hailstone diamond hard ilmenite inclusion intergrowth irregular Jagersfontein Koffyfontein laminated large crystals lump macle Micro-photo mines mond nearly nodules occur octahe octahedral octahedron faces Orange Free parallel Parry & Falck pieces plane plastic crystal PLATE pyrites pyroxenes rhombic dodecahedron rock rotation rounded seam shapeless shell shown in Fig shows simple crystal solution sort specimen Stewartite stones striæ striated striation surface Tabular Crystal temperature tetrahedral tetrahedron tetrahexahedron thick thin tint tracery triakisoctahedron trigons truncation twin Vaal River Wesselton zircon