
mineral
Polished brown jasper (probable ocean jasper or iron-rich jasper)
Microcrystalline quartz/chalcedony, SiO₂, colored by iron oxides and other inclusions
AI-generated identification · may be incorrectOpaque brown to reddish-brown with black patches, fine-grained texture, and waxy to glassy polish; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and specific gravity near 2.6.
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Physical properties
Opaque brown to reddish-brown with black patches, fine-grained texture, and waxy to glassy polish; quartz hardness is about 6.5–7 Mohs, with no visible cleavage and specific gravity near 2.6.
Formation & geological history
Jasper forms when silica-rich fluids replace or cement volcanic, sedimentary, or hydrothermal material; its exact geological age and locality cannot be determined from the photograph.
Uses & applications
Used for cabochons, beads, carvings, polished stones, and collector specimens; it has modest jewelry value unless unusually patterned or from a desirable locality.
Geological facts
Jasper is a variety of opaque chalcedony or microcrystalline quartz, and its colors commonly result from hematite, goethite, or other iron minerals.
Field identification & locations
Identify it by its opaque appearance, hardness, fine texture, and resistance to scratching by steel; common sources include India, Madagascar, Brazil, Australia, Mexico, and the western United States.