sedimentary
Jasper with Dendritic Inclusions
Microcrystalline Quartz (SiO2) with manganese or iron oxide inclusions
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.
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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.
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