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Gemstone Encyclopedia
Why Bloodstone Is a Quartz, Not a Jasper: Readi...
Bloodstone is often labeled a jasper, but mineralogically it is green chalcedony colored by iron oxide. Learn why the trade name differs from its true quartz identity.
Why Bloodstone Is a Quartz, Not a Jasper: Readi...
Bloodstone is often labeled a jasper, but mineralogically it is green chalcedony colored by iron oxide. Learn why the trade name differs from its true quartz identity.
Apophyllite: Mineral Species, Gem Variety, or J...
Apophyllite is a mineral group, not a single species. Learn how fluorapophyllite and hydroxyapophyllite differ in composition, physical properties, and gemological identification.
Apophyllite: Mineral Species, Gem Variety, or J...
Apophyllite is a mineral group, not a single species. Learn how fluorapophyllite and hydroxyapophyllite differ in composition, physical properties, and gemological identification.
Tanzanite Durability: Hardness, Toughness, and ...
Why tanzanite durability is not defined by Mohs hardness alone. Explains hardness vs toughness, one perfect cleavage, and how structure affects cutting, setting, and wear risk.
Tanzanite Durability: Hardness, Toughness, and ...
Why tanzanite durability is not defined by Mohs hardness alone. Explains hardness vs toughness, one perfect cleavage, and how structure affects cutting, setting, and wear risk.
Sinhalite and the Limits of Identifying a Gem b...
Sinhalite is a brown gem that resembles tourmaline, zircon, spinel, and garnet. Learn why visual identification fails and which gemological properties actually distinguish sinhalite.
Sinhalite and the Limits of Identifying a Gem b...
Sinhalite is a brown gem that resembles tourmaline, zircon, spinel, and garnet. Learn why visual identification fails and which gemological properties actually distinguish sinhalite.
Why Specular Hematite Looks Like Polished Metal...
Specular hematite is an iron oxide with a metallic appearance. Learn why its luster is not metallic bonding, how it forms, and how to distinguish it from magnetite, pyrite, and...
Why Specular Hematite Looks Like Polished Metal...
Specular hematite is an iron oxide with a metallic appearance. Learn why its luster is not metallic bonding, how it forms, and how to distinguish it from magnetite, pyrite, and...
Why Poudretteite Is Not a Tourmaline Lookalike:...
Why poudretteite is not treated like tourmaline. A gemological look at poudretteite's species identity, composition, rarity, and why tourmaline enhancements do not apply.
Why Poudretteite Is Not a Tourmaline Lookalike:...
Why poudretteite is not treated like tourmaline. A gemological look at poudretteite's species identity, composition, rarity, and why tourmaline enhancements do not apply.