mineral
Raw emerald-bearing beryl (probable)
Beryl, Be₃Al₂Si₆O₁₈; green color from trace chromium and/or vanadium
AI-generated identification · may be incorrectHardness 7.5–8 Mohs; translucent to opaque green, vitreous to greasy luster, hexagonal crystal structure, and poor basal cleavage. The specimen appears embedded in a gray schist or mica-rich matrix, though image identification is not definitive.
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Physical properties
Hardness 7.5–8 Mohs; translucent to opaque green, vitreous to greasy luster, hexagonal crystal structure, and poor basal cleavage. The specimen appears embedded in a gray schist or mica-rich matrix, though image identification is not definitive.
Formation & geological history
Forms in hydrothermal veins and pegmatites during late-stage igneous activity, commonly in metamorphic rocks; deposits range from Precambrian to younger ages. Major sources include Colombia, Zambia, Brazil, Zimbabwe, Russia, and Afghanistan.
Uses & applications
Gem-quality material is cut as emerald; non-gem beryl is mainly a collector specimen. Emerald value depends strongly on color, clarity, transparency, treatment, and whether the green is chromium- or vanadium-related.
Geological facts
Emerald is the green gem variety of beryl, while aquamarine is blue beryl. Most natural emeralds contain inclusions, traditionally called a jardin (“garden”).
Field identification & locations
Look for a saturated green color, hexagonal prismatic crystals, hardness above glass, and mica-rich or pegmatitic matrix; fluorite or green quartz are possible alternatives. Professional testing for refractive index and chemistry is needed for confirmation.
