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Copper-Bearing Minerals of Colorado

The state of Colorado has produced some significant copper-bearing mineral specimens.

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Analysis of HPHT-Treated Diamonds Using Fluorescence Observations

Evaluates a potential method of visually identifying HPHT-treated diamonds using microscopy to observe intense fluorescence at the facet edges and junctions.

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In Search of the Perfect Specimen

Vincent Pardieu gives insight into his interest in gems and his experiences in the field

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Gem Olivine and Calcite Mineralization Precipitated from Subduction-Derived Fluids in the Kohistan Arc-Mantle (Pakistan)

Geochemical data presented suggests remobilized CO2 and H2O from a subducted island arc helped form the calcite + olivine-bearing veins in Kohsitan, Pakistan.

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