Before proceeding to the study of precious stones as individual gems, certain physical properties common to all must be discussed, in order to bring the gems into separate classes, not only because of some chemical uniformity, but also because of the unity which exists between their physical formation and properties. The first consideration, therefore,...
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Posts Tagged ‘ classification ’
Amber
amethyst
beryl
calcite
Chalcedony
charm
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cleavage
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Fluorspar
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Precious stones & minerals
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Crystalline structure
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