mineral
Dendritic Opal
Hydrated amorphous silica with manganese oxide inclusions (SiO2·nH2O)
AI-generated identification · may be incorrectHardness of 5.5-6.5 on the Mohs scale, milky white base color with dark fern-like dendritic inclusions, vitreous to waxy luster, and amorphous crystal structure.
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Physical properties
Hardness of 5.5-6.5 on the Mohs scale, milky white base color with dark fern-like dendritic inclusions, vitreous to waxy luster, and amorphous crystal structure.
Formation & geological history
Forms in hydrothermal veins or cavities where silica-rich groundwater deposits gel, and manganese or iron oxides seep into fractures to create dendritic patterns.
Uses & applications
Primarily used as a lapidary stone for cabochons, wire-wrapping, and ornamental jewelry pieces.
Geological facts
The dendritic patterns are often mistaken for fossilized plant material, but they are actually inorganic mineral growths of manganese oxides.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and distinctive black fern-like branch patterns inside a light-colored body. Commonly found in Western Australia, Mexico, and the USA.
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