gemstone
Dendritic Agate
SiO2 (Chalcedony with manganese or iron oxide inclusions)
AI-generated identification · may be incorrectHardness of 6.5 to 7 on the Mohs scale. Displays white or translucent chalcedony background with dark, fern-like dendritic inclusions. Vitreous to waxy luster with conchoidal fracture.
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Physical properties
Hardness of 6.5 to 7 on the Mohs scale. Displays white or translucent chalcedony background with dark, fern-like dendritic inclusions. Vitreous to waxy luster with conchoidal fracture.
Formation & geological history
Formed in hydrothermal veins and cavities within volcanic or metamorphic rocks when mineral-rich water precipitates silica gel containing manganese or iron oxides.
Uses & applications
Widely used in lapidary arts for cabochons, beads, ornamental carvings, and collector display specimens.
Geological facts
The dark branching patterns are not plant fossils, but rather microscopic mineral crystals growing in dendritic formations. It has been used as a gemstone since ancient civilizations.
Field identification & locations
Easily identified in the field by its waxy luster and distinctive black mossy or tree-like inclusions trapped within translucent chalcedony. Commonly found in India, Brazil, the US, and Madagascar.
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