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List of Colour Plates
The Structure and Development
The Flamefusion Method of Crystal
15 other sections not shown
absorption bands absorption spectrum alexandrite amethyst appeared aquamarine atoms beryl birefringence blue sapphire boule brown cabochon camera cent characteristic chromium cobalt colour filter colourless composition corundum crossed filters crucible crystal growth cubic Czochralski method dark diamond dichroism doped doublet emerald examined exposure facet flame-fusion fluorescence flux flux-melt method garnet gas bubbles gemmological gemstones Gilson give glass green grown heating hexagonal hydrothermal imitation iron irradiation jadeite layer Lechleitner liquid lithium lithium niobate long-wave ultra-violet light luminescence magnification microscope natural material natural stones opal optic orange ordinary ray oxide pale phenakite phosphorescence pink plastic plate produced quartz refractive index reported rutile seed seed crystal seen short-wave ultra-violet light silica solution specific gravity star stone showed strontium titanate structure substance surface synthetic corundum synthetic emerald synthetic ruby synthetic spinel temperature titanium topaz transparent tube turquoise ultra-violet light vanadium Verneuil Verneuil process violet X-rays yellow zirconia