mineral
Herkimer Diamond (Quartz Crystal)
Silicon Dioxide (SiO2)
AI-generated identification · may be incorrectHardness: 7.0 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous; Crystal structure: Double-terminated hexagonal prisms; Cleavage: None; Specific gravity: 2.65.
- Hardness
- 7
- Color
- Colorless/Transparent
- Luster
- Vitreous
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Physical properties
Hardness: 7.0 on Mohs scale; Color: Colorless/Transparent; Luster: Vitreous; Crystal structure: Double-terminated hexagonal prisms; Cleavage: None; Specific gravity: 2.65.
Formation & geological history
Formed in vugs or cavities within the Little Falls Dolostone (sedimentary rock) during the Cambrian period. They crystallized from hydrothermal solutions roughly 500 million years ago.
Uses & applications
Mostly used in jewelry (as raw or set stones), metaphysical collecting, and as a popular specimen for mineral enthusiasts.
Geological facts
They are not actually diamonds but are called so due to their natural clarity and diamond-like faceted shape. Unlike most quartz, they grow with two natural points (double-terminated).
Field identification & locations
Identify by their double-terminated points and exceptional clarity. They are famously found in and named after Herkimer County, New York.
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