mineral

Iron-rich jasper (likely rough jasper/chert)

Microcrystalline quartz (SiO₂), colored by iron oxides

AI-generated identification · may be incorrect

Opaque, mottled reddish-brown with a dull to slightly waxy luster; quartz has Mohs hardness 7 and no cleavage, but this small rough piece cannot be tested reliably from the image.

Identified September 29, 2026More mineral →

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Physical properties

Opaque, mottled reddish-brown with a dull to slightly waxy luster; quartz has Mohs hardness 7 and no cleavage, but this small rough piece cannot be tested reliably from the image.

Formation & geological history

Silica-rich sediment or volcanic material became microcrystalline quartz, with iron oxides imparting the brown-red color. Such deposits formed in many geological settings and ages.

Uses & applications

Jasper is used for beads, cabochons, carvings, and collections; this small unpolished fragment has little commercial use.

Geological facts

Jasper is an opaque variety of chalcedony; its color and patterns vary with mineral impurities.

Field identification & locations

The opaque rusty color and fine-grained, seemingly fracture-broken surface suggest jasper or iron-stained chert. Similar material occurs worldwide; a hardness or streak test would help distinguish it from softer iron-rich rocks.