metamorphic
Emerald in Schist (Raw/Tumbled)
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Chromium/Vanadium impurities in Mica Schist
Hardness: 7.5-8.0 (Emerald) vs 2-3 (Matrix); Color: Intense green to deep black/grey; Luster: Vitreous to sub-vitreous; Crystal Structure: Hexagonal; Cleavage: Poor/Indistinct; Specific Gravity: 2.76.
- Hardness
- 7
- Color
- Intense green to deep black/grey
- Luster
- Vitreous to sub-vitreous
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Physical properties
Hardness: 7.5-8.0 (Emerald) vs 2-3 (Matrix); Color: Intense green to deep black/grey; Luster: Vitreous to sub-vitreous; Crystal Structure: Hexagonal; Cleavage: Poor/Indistinct; Specific Gravity: 2.76.
Formation & geological history
Formed via regional metamorphism and hydrothermal processes where beryllium-rich magma or fluids interact with chromium-rich metamorphic rocks like schist. Most deposits are Proterozoic to Paleozoic in age.
Uses & applications
Used primarily as gemstone rough, mineral specimens for collectors, and in metaphysical healing practices. High-quality emeralds are among the most valuable gemstones in the world.
Geological facts
The green color of emerald is caused by trace amounts of chromium or vanadium. When emerald crystals are found embedded in a dark matrix like this, they are often referred to as 'emerald in schist' or 'matrix emerald'.
Field identification & locations
Identify by looking for the distinct hexagonal crystal habit and the 'jardin' (internal inclusions). In the field, it is often found in contact zones between pegmatites and schists. Common locations include Brazil, Zambia, and Russia.
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