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, white or translucent body color with dark dendritic fern-like 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 translucent body color with dark dendritic fern-like inclusions, waxy to vitreous luster, and conchoidal fracture.
Formation & geological history
Formed from silica-rich solutions precipitating in cavities of volcanic or sedimentary rocks, often during the Cenozoic era.
Uses & applications
Used primarily for cabochons in jewelry, ornamental carvings, and appreciated by mineral collectors.
Geological facts
The dark branching patterns are not plant fossils, but rather crystallized manganese or iron oxides that seeped into micro-fractures.
Field identification & locations
Identified by its waxy luster, conchoidal fracture, and distinctive black dendritic patterns; found in regions like Australia, Mexico, and the USA.
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Gneiss or Mica Schist with Garnet
Metamorphic
Sandstone (with potential mineral staining/concretions)
Arenite (SiO2 based)
sedimentary
Tumbled granite
Granite, a coarse-grained felsic intrusive igneous rock
igneous
Pegmatite with Tourmaline and Quartz
Igneous Pegmatite
igneous
Epidote
Epidote | Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)
metamorphic
Granite
Granite (Phaneritic intrusive igneous rock)
igneous