Moss Agate
Quartz var. Chalcedony (Moss Agate) · Semi-Precious Gemstone and Decorative Stone
Crystal System
Trigonal, microcrystalline, massive habit without visible banding
Mineral Group
Silicates (Tectosilicates)
Chemical Formula
SiO2 with dendritic inclusions of iron and manganese oxides
Formation Process
Hydrothermal deposition from silica-rich groundwater filling cavities in volcanic or metamorphic rocks at low temperatures
About This Crystal
A polished tumbled stone featuring a translucent to semi-translucent colorless chalcedony base with intricate, moss-like green dendritic inclusions resembling foliage or landscapes
Physical Characteristics
Colors range from translucent white and gray to deep forest green; white streak; no true cleavage; conchoidal fracture; specific gravity around 2.60 to 2.65; brittle tenacity; vitreous to waxy luster
Optical Properties
Singly or aggregate doubly refractive; refractive index of approximately 1.530 to 1.540; no significant pleochroism or dispersion
Hardness & Durability
Origin Region
India, United States, Australia, Russia, Brazil; typically forms in volcanic and metamorphic rocks
Hardness & Durability
Mohs hardness of 6.5 to 7; good toughness and durability suitable for various jewelry applications including rings and pendants
Care & Maintenance
Clean with warm soapy water and a soft cloth; avoid harsh chemicals and prolonged exposure to direct sunlight; store separately to prevent scratching softer stones
Rarity & Value
Common and widely available; value depends on the clarity of the base chalcedony and the aesthetic appeal of the green dendritic patterns; generally affordable
Special Characteristics
Distinctive dendritic inclusions formed by metallic oxide impurities creating picturesque plant-like patterns within the quartz matrix
Lore & History
Historically used as an agricultural talisman for abundant crops and by warriors as a protective amulet; associated with the Heart Chakra in modern crystal healing, symbolizing new beginnings, growth, and a deep connection to nature (traditional beliefs, not scientific claims)