Megacrysts within xenoliths transported by explosive volcanic eruptions to the surface fascinate geologists, mineralogists and gemmologists because they are fingerprints of the Earth’s upper mantle and possible collectors' items for crystal hunters.
Read MoreGeochemical data presented suggests that remobilised CO2 and H2O from a subducted island arc helped to form the calcite and olivine-bearing veins in Kohsitan, Pakistan.
Read MoreGeochemical data presented suggests that remobilised CO2 and H2O from a subducted island arc helped to form the calcite and olivine-bearing veins in Kohsitan, Pakistan.
Read MoreThis article, from the Autumn 1991 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.
Read MoreThe state of Colorado has produced some significant copper-bearing mineral specimens.
Read MoreThis article, from the Spring 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreFrom the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.
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This article, from the Autumn 2009 issue of Gems & Gemology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemology.
Read More
This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreThis article, from the Spring 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
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