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Gemstone Encyclopedia
How Selenite Forms in Evaporite Basins and Why ...
Learn why selenite deposits are geologically restricted to evaporite basins, how coarse crystals form, and how hydrothermal occurrences like Naica differ from typical gypsum environments.
How Selenite Forms in Evaporite Basins and Why ...
Learn why selenite deposits are geologically restricted to evaporite basins, how coarse crystals form, and how hydrothermal occurrences like Naica differ from typical gypsum environments.
Why Diamond Needs a Rare Set of Conditions to Form
Diamond requires high pressure, moderate temperature, and rapid transport to the surface. Learn why pure carbon forms diamond only in specific mantle environments and how kimberlite brings it up.
Why Diamond Needs a Rare Set of Conditions to Form
Diamond requires high pressure, moderate temperature, and rapid transport to the surface. Learn why pure carbon forms diamond only in specific mantle environments and how kimberlite brings it up.
Why Sphene Splits Light So Strongly: Crystal St...
Why sphene (titanite) shows strong fire and pleochroism, how its monoclinic structure controls optical behavior, and where gem-quality deposits occur geologically.
Why Sphene Splits Light So Strongly: Crystal St...
Why sphene (titanite) shows strong fire and pleochroism, how its monoclinic structure controls optical behavior, and where gem-quality deposits occur geologically.
Coral and Directional Color: Why Pleochroism Do...
Precious coral is a biogenic carbonate aggregate, not a crystal, so it cannot show pleochroism. Learn why directional color terms do not apply and which optical effects coral genuinely shows.
Coral and Directional Color: Why Pleochroism Do...
Precious coral is a biogenic carbonate aggregate, not a crystal, so it cannot show pleochroism. Learn why directional color terms do not apply and which optical effects coral genuinely shows.
Why Blue Lace Agate Looks Different Under Chang...
Blue lace agate does not change color under different lighting. Its pale blue banding and cryptocrystalline quartz structure create a shifting appearance as light conditions change.
Why Blue Lace Agate Looks Different Under Chang...
Blue lace agate does not change color under different lighting. Its pale blue banding and cryptocrystalline quartz structure create a shifting appearance as light conditions change.
How Enhancement Alters the Appearance of Red Ja...
Why does treated red jasper look different from untreated material? Heating, dyeing, and impregnation change iron oxide color and light scattering inside a microcrystalline quartz aggregate.
How Enhancement Alters the Appearance of Red Ja...
Why does treated red jasper look different from untreated material? Heating, dyeing, and impregnation change iron oxide color and light scattering inside a microcrystalline quartz aggregate.