gemstone
Emerald in Matrix
Beryl (Be3Al2Si6O18) with Chromium/Vanadium impurities
Hardness: 7.5-8 on Mohs scale; Color: Green to bluish-green; Luster: Vitreous to waxy (when polished); Crystal System: Hexagonal; Specific Gravity: 2.67-2.78.
- Hardness
- 7
- Color
- Green to bluish-green
- Luster
- Vitreous to waxy (when polished)
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Physical properties
Hardness: 7.5-8 on Mohs scale; Color: Green to bluish-green; Luster: Vitreous to waxy (when polished); Crystal System: Hexagonal; Specific Gravity: 2.67-2.78.
Formation & geological history
Emeralds are formed in hydrothermal veins or pegmatites where beryllium-rich fluids interact with chromium or vanadium-bearing host rocks. This specimen appears to be a tumbled low-grade emerald crystal within a mica or quartz matrix.
Uses & applications
Low-grade specimens like this are used for tumbling, decorative gravel, jewelry beads, and beginner crystal collections. High-grade emeralds are prized as precious gemstones.
Geological facts
The green color of emerald is due to trace amounts of chromium or vanadium. Most emeralds contain many inclusions or internal fractures, often referred to as a 'jardin' (French for garden).
Field identification & locations
Identify by its distinctive shade of green and high hardness (it will scratch glass). Common locations include Colombia, Brazil, Zambia, and Russia. Collectible mostly for its color and association with the precious beryl variety.
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