Emerald in Matrix
Beryl var. Emerald · Precious Gemstone / Mineral Specimen
Crystal System
Hexagonal; typically occurs as prismatic crystals, though this specimen is massive or embedded in a dark schist matrix.
Mineral Group
Silicates (Cyclosilicates)
Chemical Formula
Be3Al2Si6O18 with trace Chromium (Cr) and Vanadium (V)
Formation Process
Metamorphic or Hydrothermal. Formed when beryllium-rich fluids interact with chromium or vanadium-rich metamorphic host rocks (like schist).
About This Crystal
The specimen features patches of vibrant, translucent green emerald embedded within a dark, opaque, nearly black host rock (likely biotite schist). It has a vitreous luster on the emerald sections and a duller, waxy to sub-metallic luster on the matrix.
Physical Characteristics
Color: Deep green with black matrix; Streak: White; Cleavage: Imperfect/Basal; Fracture: Conchoidal to uneven; Specific Gravity: 2.67-2.78; Fluorescence: Usually inert or weak reddish under longwave UV.
Optical Properties
Uniaxial (-); Refractive Index: 1.577–1.583; Birefringence: 0.005–0.009; Pleochroism: Distinct (blue-green to yellow-green); Singly to doubly refractive.
Hardness & Durability
Origin Region
Likely Brazil, Zambia, or Ethiopia; typically found in mica schists or within hydrothermal veins near pegmatitic intrusions.
Hardness & Durability
Mohs Hardness: 7.5–8.0. While hard, it is often brittle due to inclusions (internally 'jardin'), making it susceptible to impact damage.
Care & Maintenance
Avoid ultrasonic and steam cleaners. Clean with warm soapy water and a soft brush. Keep away from harsh chemicals and extreme temperature changes which may expand internal fractures.
Rarity & Value
Valuable as a collector's specimen. Value depends on the saturation and clarity of the green beryl and the contrast with the matrix. Gem-quality facet grade is very rare.
Special Characteristics
Features the 'Jardin' (garden) of internal inclusions characteristic of natural emerald. The dark matrix provides a stark contrast highlighting the green mineralization.
Lore & History
Emeralds have been prized since ancient Egypt (Cleopatra's mines). Historically associated with rebirth, fertility, and love. In metaphysical traditions, it is linked to the Heart Chakra and believed to promote domestic bliss and loyalty.