Handbook of Gem Identification |
Contents
Chapter Page I Introduction | 1 |
The Nature of Gemstones | 3 |
Cleavage Fracture and Hardness | 8 |
Copyright | |
27 other sections not shown
Common terms and phrases
absorption spectra alexandrite almandite amber Andalusite Apatite appearance beryl biaxial birefringence blue brown bubbles cabochon calcite chalcedony Chapter characteristic chatoyancy chrysoberyl cleavage color colorless coral corundum crystal cultured pearls dark demantoid detected determination diamond dichroism distinguished double refraction facet edges feldspar Figure fluorescence Fluorite fracture garnet-and-glass doublet gem material Gemological gemologist gemstones girdle green Grossularite Gubelin hardness hematite identification immersion Important Gemstones inclusions index reading indices jade jadeite jewelry light lines liquid loupe luster magnification methylene iodide microscope mineral moonstone natural pearl nephrite nontransparent opal opaque optic Orthoclase peridot pink plastic pleochroism polariscope Polaroid properties Pyrope quartz rarely refractive index refractometer resembles Rhodolite ruby rutile Scapolite singly refractive Sinhalite specific gravity spectroscope spectrum sphene spinel Spodumene stone substitutes surface synthetic corundum synthetic emerald synthetic rutile synthetic spinel tion topaz tourmaline translucent transparent triplet turquoise ultra-violet uniaxial usually variety violet visible yellow zircon