mineral
Tumbled jasper (likely brecciated or iron-stained jasper)
Microcrystalline quartz, SiO₂, colored by iron oxides
AI-generated identification · may be incorrectOpaque, rusty orange and dark gray-brown with a polished surface; quartz hardness about 6.5–7 Mohs, vitreous to waxy luster, no visible crystals or cleavage. Exact variety cannot be confirmed from the image alone.
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Physical properties
Opaque, rusty orange and dark gray-brown with a polished surface; quartz hardness about 6.5–7 Mohs, vitreous to waxy luster, no visible crystals or cleavage. Exact variety cannot be confirmed from the image alone.
Formation & geological history
Jasper forms when silica-rich fluids fill cavities or replace sediments, with iron oxides producing red-orange colors; it occurs in many ages and geological settings.
Uses & applications
Used for beads, cabochons, ornaments, and lapidary collections; jasper is also a historical decorative stone.
Geological facts
Jasper is an opaque variety of chalcedony, distinguished from many agates by its opacity and abundant mineral inclusions.
Field identification & locations
The rounded shape and smooth polish indicate tumbling or lapidary finishing. Look for opaque, fine-grained silica with iron-rich color; common sources include Brazil, India, Madagascar, and the western United States.
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