mineral

Polished brecciated jasper (likely)

Microcrystalline quartz, SiO₂, with iron-oxide-rich brown fragments and pale silica

AI-generated identification · may be incorrect

Opaque cream, tan, and dark-brown angular patches with a polished, waxy-to-glassy luster; quartz hardness is about 7 Mohs and crystal structure is trigonal, though crystals are microscopic. The rounded shape is consistent with a tumbled stone; identification from the image is provisional.

Identified September 27, 2026More mineral →

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Physical properties

Formation & geological history

Silica-rich fluids cemented or replaced fractured rock, with iron oxides providing the brown coloration; the specimen’s geological age and source cannot be determined from the image.

Uses & applications

Used for lapidary carving, beads, jewelry, and collections; jasper is also used decoratively.

Geological facts

Jasper is an opaque variety of chalcedony, and brecciated varieties preserve fragments cemented together by silica.

Field identification & locations

Look for opaque, hard material with angular color patches and a smooth polish; common sources include Brazil, India, Madagascar, and the United States. A scratch test or gemological examination can help distinguish jasper from other patterned stones.