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Gemstone Encyclopedia
Fluorite Color Zoning: Why One Crystal Can Hold...
Why does one fluorite crystal show several colors? Learn how color zoning forms during growth, how trace elements and radiation create it, and how to distinguish zoning from cleavage and...
Fluorite Color Zoning: Why One Crystal Can Hold...
Why does one fluorite crystal show several colors? Learn how color zoning forms during growth, how trace elements and radiation create it, and how to distinguish zoning from cleavage and...
Hessonite Garnet and the Limits of Pleochroism:...
Hessonite is a cubic grossular garnet, so true pleochroism is absent. Learn why its orange-brown color is body color, how inclusions create apparent variation, and what this means for identification.
Hessonite Garnet and the Limits of Pleochroism:...
Hessonite is a cubic grossular garnet, so true pleochroism is absent. Learn why its orange-brown color is body color, how inclusions create apparent variation, and what this means for identification.
Sinhalite and the Limits of Specific Gravity as...
Why sinhalite and peridot were confused, how specific gravity near 3.47 to 3.50 distinguishes sinhalite from peridot, and the limits of density as a gem identification test.
Sinhalite and the Limits of Specific Gravity as...
Why sinhalite and peridot were confused, how specific gravity near 3.47 to 3.50 distinguishes sinhalite from peridot, and the limits of density as a gem identification test.
Kunzite Under the Lens: What Specific Gravity R...
Kunzite is the pink variety of spodumene with a specific gravity near 3.18. Learn how density distinguishes kunzite from pink lookalikes and how it applies to laboratory-grown material.
Kunzite Under the Lens: What Specific Gravity R...
Kunzite is the pink variety of spodumene with a specific gravity near 3.18. Learn how density distinguishes kunzite from pink lookalikes and how it applies to laboratory-grown material.
Is Fire Opal a Mineral Species, a Variety, or J...
Fire opal is a trade and descriptive name for opal with a warm body color, not a mineral species or a formally defined variety. Learn why its identity is hydrated...
Is Fire Opal a Mineral Species, a Variety, or J...
Fire opal is a trade and descriptive name for opal with a warm body color, not a mineral species or a formally defined variety. Learn why its identity is hydrated...
Why Emerald Is Hexagonal: Crystal System, Habit...
Emerald is a green variety of beryl with a hexagonal crystal structure. Learn how the crystal system differs from crystal habit and what it reveals about emerald properties.
Why Emerald Is Hexagonal: Crystal System, Habit...
Emerald is a green variety of beryl with a hexagonal crystal structure. Learn how the crystal system differs from crystal habit and what it reveals about emerald properties.