Green Chalcedony
Quartz var. Chalcedony · Semi-Precious Gemstone and Decorative Stone.
Crystal System
Trigonal, microcrystalline (cryptocrystalline) quartz habit forming massive, nodular, or botryoidal structures.
Mineral Group
Silicates, specifically Tectosilicates.
Chemical Formula
SiO2
Formation Process
Hydrothermal and sedimentary processes involving the deposition of silica-rich solutions at low temperatures in cavities of rocks.
About This Crystal
The specimen features an oval cabochon-cut, deep green translucent stone with a smooth polished surface, exhibiting a waxy to vitreous luster, set in an ornate metallic ring.
Physical Characteristics
Color ranges from light to dark green, white streak, no distinct cleavage, conchoidal fracture, specific gravity around 2.60 to 2.65, brittle tenacity.
Optical Properties
Refractive index ranges from 1.530 to 1.540, doubly refractive with microcrystalline structure, generally non-pleochroic.
Hardness & Durability
Origin Region
Found globally with notable sources in India, Brazil, Madagascar, and the United States, typically in volcanic and sedimentary environments.
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness making it durable and suitable for everyday jewelry use.
Care & Maintenance
Clean with warm soapy water using a soft brush. Avoid harsh chemicals, ultrasonic cleaners, and prolonged direct sunlight to prevent potential alterations.
Rarity & Value
Common to uncommon depending on color saturation and transparency; widely accessible and affordable, with value increasing for rich, natural green varieties.
Special Characteristics
Cryptocrystalline structure causing light to scatter softly through the stone, producing a pleasant translucency and soft glow.
Lore & History
Historically used in ancient intaglios and seals. In traditional crystal lore, green chalcedony is associated with emotional balance, vitality, and the heart chakra.