Guide to the Collection of Gemstones in the Museum of Practical Geology |
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GT THE COLL OF GEMSTONES IN TH Eng Museum of Practical Geology (London,W. F. P. McLintock No preview available - 2016 |
Common terms and phrases
agate Almandine alumina aluminium amethyst amount Andalusite angle appearance artificial avanturine beautiful beryl blue ground Brazil brilliant brown cabochon calcium carats carbon cat's-eye cavities Ceylon chalcedony chromium chrysoberyl chrysolite cleavage colourless consists corundum crystallised crystals belong cut en cabochon cut specimen cut stone Demantoid diamond dichroic dichroism dichroscope diopside double Doubly refracting emerald Epidote examples exhibited facets felspar Fluor-spar garnet gemstones granite green hardness heat Idocrase Iolite iron jade jadeite jewellery known Kyanite light lustre magnesium metals microscope mineral mixed cut occurs olivine opaque optical ornamental oxide pale parallel parent rock Phenacite pink plane polished possess precious opal precious stones properties rays refracting stones refractive index resemblance rock-crystal rough material ruby sapphire serpentine silicate singly refracting sodium softer sometimes specific gravity specimens shown Sphene spinel Spodumene surface tint topaz tourmaline translucent transparent turquois usually variety whilst yellow yellowish-green zircon