gemstone
Rough Emerald
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
Hardness: 7.5-8.0 (Mohs scale), Color: Vivid green to bluish-green, Luster: Vitreous, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.67-2.78
- Hardness
- 7
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Physical properties
Hardness: 7.5-8.0 (Mohs scale), Color: Vivid green to bluish-green, Luster: Vitreous, Crystal structure: Hexagonal/Trigonal, Specific gravity: 2.67-2.78
Formation & geological history
Typically found in metamorphic rocks such as mica schists or in hydrothermal veins. Formation involves contact between beryllium-rich pegmatites and chromium-bearing rocks. Locations: Colombia, Brazil, and Zambia are primary sources.
Uses & applications
Primarily used as a highly valuable gemstone in jewelry; rough specimens are popular as mineral collectibles.
Geological facts
Emeralds are one of the 'Big Four' precious gemstones. Natural emeralds almost always contain 'jardin' (internal inclusions and fractures) which are used to prove authenticity.
Field identification & locations
Check for a hexagonal crystal habit and characteristic green color. In the field, look for quartz veins or mica schist matrices in known mining districts.
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