Tree Agate
Quartz var. Dendritic Agate (Chalcedony) · Semi-Precious Gemstone, Decorative Stone
Crystal System
Trigonal, microcrystalline, massive habit, tumbling or polishing form
Mineral Group
Silicates, Tectosilicates
Chemical Formula
SiO2 with inclusions of iron or magnesium oxides
Formation Process
Hydrothermal and sedimentary deposition in cavities of volcanic rocks from silica-rich solutions at low temperatures and pressures
About This Crystal
A tumbled, polished smooth pebble featuring a translucent to opaque milky white chalcedony base with striking deep green dendritic or moss-like inclusions resembling foliage or tree branches
Physical Characteristics
White to milky body with dark green inclusions, white streak, conchoidal fracture, no distinct cleavage, specific gravity of approximately 2.58 to 2.62, brittle tenacity, vitreous to waxy luster
Optical Properties
Refractive index of 1.544 to 1.553, doubly refractive with low birefringence, no pleochroism, aggregate optic sign
Hardness & Durability
Origin Region
India, Brazil, United States, Madagascar, Australia, in volcanic and metamorphic rocks
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness due to microcrystalline structure, stable against most chemicals except hydrofluoric acid, highly durable for everyday jewelry use
Care & Maintenance
Clean with warm soapy water and a soft cloth, avoid harsh chemical cleaners and prolonged exposure to high heat, store separately to prevent scratching softer stones
Rarity & Value
Common and widely available, value depends on the clarity of the base stone and the aesthetic appeal of the green dendritic patterns, generally affordable with low to moderate price ranges
Special Characteristics
Distinctive dendritic and mossy plant-like inclusions formed by trapped microscopic mineral oxides within the translucent quartz matrix
Lore & History
Historically associated with agriculture, connection to nature, and abundance in ancient civilizations; in modern crystal healing, it is traditionally linked to the heart chakra, inner peace, and grounding energy