sedimentary

Jasper with Dendritic Inclusions

Microcrystalline Quartz (SiO2) with manganese or iron oxide inclusions

AI-generated identification · may be incorrect

Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, conchoidal fracture, opaque transparency, and exhibits distinct dark dendritic or branching patterns on a brownish-tan background.

Identified August 7, 2026More sedimentary →

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Physical properties

Hardness of 6.5 to 7 on the Mohs scale, earthy to vitreous luster, conchoidal fracture, opaque transparency, and exhibits distinct dark dendritic or branching patterns on a brownish-tan background.

Formation & geological history

Formed through the deposition of silica-rich fluids in rock fractures and cavities, often occurring in sedimentary or volcanic environments over millions of years.

Uses & applications

Commonly used for lapidary work, cabochons, ornamental carvings, decorative landscaping stones, and as a collectible specimen.

Geological facts

The dark branching patterns often mistaken for fossils are actually microscopic crystals of manganese or iron oxides that crystallized within cracks in the rock.

Field identification & locations

Easily identified by its hardness, smooth water-worn surface, waxy luster, and unique dark dendritic markings. Found worldwide in riverbeds, glacial tills, and gravel deposits.