Tree Agate
Quartz var. Chalcedony (Dendritic Agate) · Semi-Precious Gemstone and Mineral Specimen
Crystal System
Trigonal, massive to microcrystalline habit
Mineral Group
Silicates, specifically Tectosilicates
Chemical Formula
SiO2 with inclusions of iron or manganese oxides
Formation Process
Hydrothermal deposition and low-temperature precipitation in cavities of volcanic and metamorphic rocks
About This Crystal
A milky-white to translucent chalcedony matrix featuring striking deep green dendritic inclusions resembling plant or tree growth patterns.
Physical Characteristics
White to colorless body with dark green to black dendritic markings; white streak; no cleavage; conchoidal fracture; specific gravity around 2.60 to 2.65; brittle tenacity; generally inert under UV light
Optical Properties
Refractive index of approximately 1.530 to 1.540, doubly refractive with aggregate birefringence, vitreous to waxy luster, translucent to opaque transparency
Hardness & Durability
Origin Region
India, Brazil, USA, Madagascar, and Australia
Hardness & Durability
Mohs hardness of 6.5 to 7, good toughness, durable and suitable for everyday jewelry use
Care & Maintenance
Clean with warm soapy water and a soft brush, avoid harsh chemicals, ultrasonic cleaners, and prolonged direct sunlight
Rarity & Value
Common to uncommon, value depends on the clarity of the base stone and the aesthetic appeal of the dendritic patterns, generally affordable
Special Characteristics
Distinctive dendritic inclusions that create natural, tree-like or fern-like patterns trapped within the chalcedony matrix
Lore & History
Historically associated with agriculture, fertility, and deep connection to nature; often used in crystal healing to promote inner peace, patience, and groundedness