mineral

Dendritic jasper/chalcedony

Silica-rich microcrystalline quartz (SiO₂) with manganese-oxide dendrites

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; tan to ochre, opaque, with black branching fern-like patterns. Dull to slightly waxy luster, cryptocrystalline structure, no visible cleavage, and typical specific gravity near 2.6.

Identified August 18, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich groundwater filled fractures or cavities in volcanic or sedimentary host rock; manganese and iron oxides crystallized in branching dendritic patterns. The specimen’s precise geological age cannot be determined from the image.

Uses & applications

Used as a lapidary stone for cabochons, carvings, tumbled stones, and display pieces; it is generally decorative rather than industrial. Value depends on contrast, polish, pattern, and size.

Geological facts

The fern-like markings are mineral dendrites, not fossils or organic plant material. Similar material is commonly sold as dendritic jasper, dendritic agate, or scenic stone.

Field identification & locations

Identify by testing for glass-scratching hardness, examining the natural branching surface patterns, and checking that patterns lie within the stone rather than on a coating. Common sources include India, Madagascar, Brazil, Mexico, and the western United States.