gemstone
Dendritic Opal
Hydrated amorphous silica with manganese or iron oxide dendrites (SiO2·nH2O)
AI-generated identification · may be incorrectHardness of 5.5-6.5 on the Mohs scale, white or cream body color with dark fern-like dendritic inclusions, waxy to vitreous luster, and conchoidal fracture.
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Physical properties
Hardness of 5.5-6.5 on the Mohs scale, white or cream body color with dark fern-like dendritic inclusions, waxy to vitreous luster, and conchoidal fracture.
Formation & geological history
Formed through the deposition of silica-rich water in cavities and fissures of rocks, often associated with volcanic activity.
Uses & applications
Used primarily in lapidary arts, ornamental carvings, and unique jewelry pieces.
Geological facts
The dark branching patterns are not plant fossils, but rather microscopic crystals of manganese or iron oxides growing in a tree-like pattern.
Field identification & locations
Identified easily by its porcelain-like white background contrasted with dark, branching dendrites; commonly sourced from Australia, the USA, and Madagascar.
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