mineral
Emerald in Matrix (Quartz/Calcite)
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
AI-generated identification · may be incorrectHardness: 7.5-8.0 (Beryl), Color: Vivid green streak in white/grey matrix, Luster: Vitreous to greasy, Crystal structure: Hexagonal, Cleavage: Indistinct/Poor, Specific gravity: 2.76
- Hardness
- 7
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Physical properties
Hardness: 7.5-8.0 (Beryl), Color: Vivid green streak in white/grey matrix, Luster: Vitreous to greasy, Crystal structure: Hexagonal, Cleavage: Indistinct/Poor, Specific gravity: 2.76
Formation & geological history
Formed in metamorphic rocks (schists) or hydrothermal veins where beryllium-rich fluids interact with chromium or vanadium bearing rocks. Localities include Colombia, Brazil, and Zambia.
Uses & applications
Jewelry (gemstones), mineral collecting, and historical status as one of the 'Big Four' precious stones.
Geological facts
Emeralds are green beryls; without the trace elements of chromium or vanadium, the mineral would simply be clear or another color like aquamarine. This specific sample is a low-grade 'rough' specimen.
Field identification & locations
Identified by its distinctive green hexagonal prisms or masses within a lighter parent rock (matrix). Field identification includes checking for hardness and the lack of reaction to HCl unless the matrix is calcite.
