Moss Agate
Quartz var. Chalcedony (Moss Agate) · Semi-Precious Gemstone / Ornamental Stone
Crystal System
Trigonal, microcrystalline habit, typically forming in massive or nodular forms with dendritic inclusions
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2
Formation Process
Hydrothermal and secondary deposition processes where silica-rich groundwater fills cavities in volcanic rocks, with manganese and iron oxides creating the moss-like inclusions
About This Crystal
An oval-shaped cabochon featuring translucent to semi-translucent chalcedony with intricate, dendritic green inclusions that resemble moss or foliage, accompanied by milky white patches and a bluish optical sheen
Physical Characteristics
Green and white body color with dendritic patterns, white streak, conchoidal fracture, no cleavage, specific gravity of approximately 2.60 to 2.65, brittle tenacity, and vitreous to waxy luster
Optical Properties
Uniaxial positive with a refractive index of roughly 1.530 to 1.540, low birefringence, generally displays no pleochroism due to the microcrystalline structure, but exhibits localized adularescent or sheen effects
Hardness & Durability
Origin Region
India, United States, Australia, Russia, and Brazil; typically found in volcanic and metamorphic rocks
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness making it durable for general jewelry use, resistant to common acids except hydrofluoric acid
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemicals or prolonged exposure to high heat and direct sunlight, store separately to prevent scratching softer stones
Rarity & Value
Common to uncommon; value is determined by the clarity of the base chalcedony and the aesthetic appeal of the moss-like inclusions, generally affordable with prices ranging from low to moderate
Special Characteristics
Dendritic mineral inclusions of hornblende, chlorite, or iron/manganese oxides creating vegetative patterns inside the stone, along with a subtle iridescent or chatoyant patch
Lore & History
Historically used as a talisman by ancient civilizations for agriculture and connection to nature, associated in modern crystal healing with the heart chakra, abundance, growth, and emotional balance