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Gemstone Encyclopedia
The Color of Andalusite: How Trace Elements Sha...
Explore how iron and manganese trace elements create the distinctive color zoning and pleochroism of andalusite, explaining its green, brown, and pink hues.
The Color of Andalusite: How Trace Elements Sha...
Explore how iron and manganese trace elements create the distinctive color zoning and pleochroism of andalusite, explaining its green, brown, and pink hues.
Cat's Eye Chrysoberyl vs. Quartz Cat's Eye: Wha...
Discover how inclusions in cat's eye chrysoberyl and quartz cat's eye create chatoyancy and help gemologists distinguish these lookalikes, with notes on synthetic materials.
Cat's Eye Chrysoberyl vs. Quartz Cat's Eye: Wha...
Discover how inclusions in cat's eye chrysoberyl and quartz cat's eye create chatoyancy and help gemologists distinguish these lookalikes, with notes on synthetic materials.
Malachite: The Distinction Between a Common Min...
Learn how malachite forms as a secondary copper mineral, why certain deposits are notable, and why its geographic origin does not alter its mineral identity or classification.
Malachite: The Distinction Between a Common Min...
Learn how malachite forms as a secondary copper mineral, why certain deposits are notable, and why its geographic origin does not alter its mineral identity or classification.
Calcite Crystal Habits: How Structure Shapes Ap...
A gemological look at calcite's many crystal habits, the structural controls behind them, and how distinctions in form and physical properties aid identification.
Calcite Crystal Habits: How Structure Shapes Ap...
A gemological look at calcite's many crystal habits, the structural controls behind them, and how distinctions in form and physical properties aid identification.
Green Sapphire: How Its Optical Properties Defi...
Understand green sapphire: its corundum mineral family, the iron and titanium color mechanism, pleochroism, refractive index, and how optical properties distinguish it from lookalikes.
Green Sapphire: How Its Optical Properties Defi...
Understand green sapphire: its corundum mineral family, the iron and titanium color mechanism, pleochroism, refractive index, and how optical properties distinguish it from lookalikes.
Demantoid Garnet: How Its Crystal Structure Sha...
Explore how demantoid garnet's crystal structure, isotropic optics, and serpentinite host rocks shape its identity, inclusions, and exceptional fire.
Demantoid Garnet: How Its Crystal Structure Sha...
Explore how demantoid garnet's crystal structure, isotropic optics, and serpentinite host rocks shape its identity, inclusions, and exceptional fire.