Mineral in Metamorphic Rock
Raw Emerald in Schist Matrix
Beryl (Be3Al2Si6O18) in Mica Schist
Emerald portion: Hardness 7.5-8, green color, vitreous luster, hexagonal crystal system. Schist matrix: Silvery-grey, foliated/platy texture with high mica content, softer than the emerald.
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Physical properties
Emerald portion: Hardness 7.5-8, green color, vitreous luster, hexagonal crystal system. Schist matrix: Silvery-grey, foliated/platy texture with high mica content, softer than the emerald.
Formation & geological history
Formed during regional metamorphism where beryllium-rich fluids interact with chromium or vanadium-bearing host rocks, typically in schist or phyllite formations.
Uses & applications
Used primarily as rough specimens for gemstone collectors, mineral education, or potentially for faceting if the gem-quality portion is sufficient.
Geological facts
Emerald is the green variety of beryl. The green color is caused by trace amounts of chromium or sometimes vanadium. Emeralds are one of the 'Big Three' precious gemstones.
Field identification & locations
Identify by looking for green hexagonal crystals embedded within a flaky, layered metamorphic matrix like mica schist. Common locations include Brazil, Russia, and North Carolina, USA.
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