mineral
Rough Emerald
Emerald (Beryl), Be3Al2(SiO3)6
AI-generated identification · may be incorrectHardness: 7.5-8.0 (Mohs scale), Color: Vivid green to bluish green (due to chromium/vanadium), Luster: Vitreous, Structure: Hexagonal, Specific Gravity: 2.67-2.78
- Hardness
- 7
- Luster
- Vitreous, Structure: Hexagonal, Specific Gravity: 2
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Physical properties
Hardness: 7.5-8.0 (Mohs scale), Color: Vivid green to bluish green (due to chromium/vanadium), Luster: Vitreous, Structure: Hexagonal, Specific Gravity: 2.67-2.78
Formation & geological history
Formed in hydrothermal veins or pegmatites where beryllium-rich fluids interact with chromium or vanadium-bearing host rocks like schist or limestone.
Uses & applications
Primarily used as a precious gemstone in jewelry. Low-quality specimens are kept as mineral samples for collectors or research.
Geological facts
Emeralds are the most famous variety of the mineral Beryl. Unlike most gems, inclusions (called 'jardin') are generally accepted as proof of authenticity.
Field identification & locations
Identify by its hexagonal crystal habit and distinctive green color. Look for it in metamorphic schists or hydrothermal deposits. Major sources include Colombia, Brazil, and Zambia.
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Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
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Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
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Granite
Granite (Phaneritic intrusive igneous rock)
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Septarian Pebble
Septarian nodule / Concretion
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