
gemstone
Likely raw emerald or green beryl
Beryl, Be₃Al₂Si₆O₁₈; green color typically from chromium or vanadium
AI-generated identification · may be incorrectSmall opaque-to-translucent, granular green crystal with vitreous-to-dull luster; beryl has Mohs hardness 7.5–8, hexagonal crystal structure, no prominent cleavage, and specific gravity about 2.63–2.92.
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Physical properties
Small opaque-to-translucent, granular green crystal with vitreous-to-dull luster; beryl has Mohs hardness 7.5–8, hexagonal crystal structure, no prominent cleavage, and specific gravity about 2.63–2.92.
Formation & geological history
Forms mainly in hydrothermal pegmatites and metamorphic zones when beryllium-rich fluids interact with chromium- or vanadium-bearing rocks. Most gem emerald is Paleozoic to younger, though age varies by deposit.
Uses & applications
Gem-quality material is cut for jewelry; lower-grade specimens are collected or used decoratively. This piece appears small and heavily included, limiting commercial gem use.
Geological facts
The photograph alone cannot distinguish emerald from other green minerals such as nephrite, serpentine, aventurine, or green tourmaline. Emerald is defined by beryl composition, not simply by green color.
Field identification & locations
Common sources include Colombia, Zambia, Brazil, Ethiopia, Pakistan, and Afghanistan. Confirm with hardness, refractive index, specific gravity, and ideally Raman or chemical testing; avoid scratching the specimen unnecessarily.
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