mineral
Beryl (Emerald Variety)
Beryllium aluminum silicate (Be3Al2Si6O18)
AI-generated identification · may be incorrectHardness: 7.5-8.0 (Mohs). Color: Pale to deep green (caused by chromium or vanadium). Luster: Vitreous (glassy). Crystal structure: Hexagonal/Prismatic. Cleavage: Indistinct. Specific Gravity: 2.67-2.78.
- Hardness
- 7
- Color
- Pale to deep green (caused by chromium or vanadium)
- Luster
- Vitreous (glassy)
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Physical properties
Hardness: 7.5-8.0 (Mohs). Color: Pale to deep green (caused by chromium or vanadium). Luster: Vitreous (glassy). Crystal structure: Hexagonal/Prismatic. Cleavage: Indistinct. Specific Gravity: 2.67-2.78.
Formation & geological history
Formed in hydrothermal veins or pegmatites where beryllium-rich fluids interact with chromium or vanadium-rich rocks (like schists or carbonaceous limestones). Geological age varies globally from Proterozoic to Cenozoic.
Uses & applications
High-quality specimens are used in fine jewelry as gemstones. Lower grade or industrial beryl is a source of beryllium metal used in aerospace and electronics.
Geological facts
Green beryl is only considered an 'emerald' if the color is deep enough; lighter specimens are simply called 'green beryl'. The Gachala Emerald (858 carats) is one of the most famous uncut specimens.
Field identification & locations
Identify in the field by its hexagonal crystal habit and extreme hardness (cannot be scratched by quartz). Commonly found in Colombia, Brazil, Ethiopia, and North Carolina (USA). Look for hexagonal prisms in micaceous schist matrices.
