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Gemstone Encyclopedia
Reading Color Banding in Scapolite and Its Look...
How color zoning in scapolite records crystal growth and helps distinguish it from amethyst, tourmaline, and glass, with a clear look at the limits of visual identification.
Reading Color Banding in Scapolite and Its Look...
How color zoning in scapolite records crystal growth and helps distinguish it from amethyst, tourmaline, and glass, with a clear look at the limits of visual identification.
Yellow Sapphire Without a Single Yellow Crystal...
How aggregate structure, twinning, and color zoning vary in yellow sapphire corundum, what grain boundaries mean for cutting and identification, and why internal features are clues rather than proof.
Yellow Sapphire Without a Single Yellow Crystal...
How aggregate structure, twinning, and color zoning vary in yellow sapphire corundum, what grain boundaries mean for cutting and identification, and why internal features are clues rather than proof.
Rubellite's Glow: Why Some Tourmalines Light Up...
Rubellite fluorescence depends on manganese activators and iron quenchers. Learn why red tourmaline luminesces under UV, why many stones stay dark, and why the glow cannot identify a famous source.
Rubellite's Glow: Why Some Tourmalines Light Up...
Rubellite fluorescence depends on manganese activators and iron quenchers. Learn why red tourmaline luminesces under UV, why many stones stay dark, and why the glow cannot identify a famous source.
Moissanite: Natural Meteoritic Crystals and The...
A gemological reference on moissanite as silicon carbide, covering natural meteoritic formation, laboratory synthesis, optical properties, identification limits, and trade-name distinctions.
Moissanite: Natural Meteoritic Crystals and The...
A gemological reference on moissanite as silicon carbide, covering natural meteoritic formation, laboratory synthesis, optical properties, identification limits, and trade-name distinctions.
Bronzite Under Crossed Polarizers: What Its Opt...
A gemological reference on bronzite optics: how its refractive index and birefringence compare with related silicates, why biaxial character is often unreadable in cut stones, and what the bronze sheen...
Bronzite Under Crossed Polarizers: What Its Opt...
A gemological reference on bronzite optics: how its refractive index and birefringence compare with related silicates, why biaxial character is often unreadable in cut stones, and what the bronze sheen...
Unakite Is Not a Mineral: Reading a Rock Throug...
Unakite is an altered granitic rock of epidote, pink orthoclase, and quartz. Learn why it is not a mineral species and how its rock identity shapes its properties.
Unakite Is Not a Mineral: Reading a Rock Throug...
Unakite is an altered granitic rock of epidote, pink orthoclase, and quartz. Learn why it is not a mineral species and how its rock identity shapes its properties.