mineral
Dendritic Opal
Hydrated amorphous silica with manganese/iron oxide dendrites (SiO2·nH2O)
AI-generated identification · may be incorrectHardness of 5.5-6.5 on the Mohs scale, white to translucent body color with dark fern-like dendritic inclusions, waxy to vitreous luster, and amorphously structured without true cleavage.
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Physical properties
Hardness of 5.5-6.5 on the Mohs scale, white to translucent body color with dark fern-like dendritic inclusions, waxy to vitreous luster, and amorphously structured without true cleavage.
Formation & geological history
Formed through the low-temperature deposition of silica-rich groundwater in rock cavities and fissures, often occurring in volcanic or sedimentary environments.
Uses & applications
Widely utilized in lapidary arts for cabochons, decorative carvings, unique jewelry pieces, and prized by mineral collectors.
Geological facts
The dark branching patterns are not plant fossils, but rather microscopic mineral crystals of manganese or iron oxides that grew tree-like formations inside the stone.
Field identification & locations
Easily identified by its distinctive waxy luster and contrasting dark dendritic inclusions within a pale or translucent matrix; commonly sourced from locations like Australia, Mexico, and the western United States.
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