mineral

Weathered iron-rich stone, possibly jasper or chert

Microcrystalline quartz (SiO₂), likely stained by iron oxides/hydroxides

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; brown, amber, reddish, and dark gray colors with earthy to waxy luster. It appears massive and non-cleavable, with conchoidal-looking fractures; exact composition cannot be confirmed from the image.

Identified August 17, 2026More mineral →

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Physical properties

Formation & geological history

Likely silica-rich material formed by chemical precipitation or replacement in sedimentary environments, later colored by oxidation and weathering of iron. Its geological age is indeterminate from appearance alone.

Uses & applications

Common jasper or chert is used for cabochons, beads, carvings, polished stones, and lapidary specimens; poorer material has little industrial value.

Geological facts

The dark patches may be manganese or iron-oxide concentrations, while the rusty brown coloration commonly reflects hematite or goethite. Surface texture suggests natural weathering rather than a fresh crystal face.

Field identification & locations

Test for a glassy/conchoidal break and inability to scratch it with a steel knife; quartz-rich material should scratch ordinary glass. Commonly found in weathered sedimentary formations, gravel beds, and iron-rich soils; acid testing is generally uninformative.