Dendritic Agate
Quartz var. Chalcedony with manganese oxide inclusions · Semi-Precious Gemstone / Ornamental Stone
Crystal System
Trigonal, microcrystalline, massive or tumbled habit
Mineral Group
Silicates (Subgroup: Tectosilicates)
Chemical Formula
SiO2 with inclusions of manganese oxides (like pyrolusite)
Formation Process
Hydrothermal and sedimentary processes where silica-rich fluids permeate rock cavities, accompanied by mineral-rich water seeping through fine fissures, precipitating dendritic patterns of iron or manganese oxides.
About This Crystal
A polished, tumbled stone with a warm golden-yellow to honey-orange translucent body, displaying characteristic dark, fern-like or branching dendritic inclusions resembling miniature trees or moss.
Physical Characteristics
Color is yellow-orange with black/dark brown inclusions; white streak; no true cleavage; conchoidal fracture; specific gravity around 2.58-2.62; brittle tenacity; vitreous to waxy luster when polished.
Optical Properties
Uniaxial positive, doubly refractive with very low birefringence; transparent to translucent; lacks chatoyancy or asterism, defined primarily by its inclusions.
Hardness & Durability
Origin Region
Found globally including India, Brazil, Madagascar, the United States, and Kazakhstan; typically forms in volcanic cavities and sedimentary rock fractures.
Hardness & Durability
Mohs hardness of 6.5 to 7; good toughness and durability, making it well-suited for various types of jewelry wear.
Care & Maintenance
Clean with warm soapy water and a soft brush; avoid harsh chemicals and prolonged exposure to direct sunlight to maintain the integrity of the stone.
Rarity & Value
Common to uncommon depending on the clarity of the background and the aesthetic appeal of the dendrites; valued moderately as a decorative or jewelry stone.
Special Characteristics
Features prominent dendritic or arborescent inclusions created by iron or manganese oxides spreading through micro-fractures.
Lore & History
Historically associated with abundance, agricultural success, and connection to nature; often used in modern crystal healing to promote patience, inner stability, and connection to the earth realm.