sedimentary

Yellow-brown jasper (likely iron-stained chert)

Microcrystalline quartz (SiO₂), commonly called jasper when opaque and colored by impurities

AI-generated identification · may be incorrect

Opaque ochre to brown, dull to waxy luster, with fine layering and conchoidal-looking fractures. Quartz hardness is about 7 Mohs; crystals are microscopic, with no cleavage. The image alone cannot establish exact composition or specific gravity.

Identified September 28, 2026More sedimentary →

Explore Yellow-brown jasper (likely iron-stained chert) in the encyclopedia →

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Physical properties

Formation & geological history

Silica-rich sediment or replacement material later hardened into microcrystalline quartz; iron oxides provide the yellow-brown color. Such material forms in varied geological settings and ages.

Uses & applications

Used as a lapidary stone for cabochons, carvings, and polished ornaments; also collected as a rough specimen.

Geological facts

Jasper is a descriptive lapidary name rather than a single precisely defined rock type; yellow-brown varieties owe their color largely to iron-bearing minerals.

Field identification & locations

Look for opaque, fine-grained material, earthy coloring, and curved fracture surfaces; jasper/chert occurs worldwide in sedimentary and volcanic terrains. This hand-sized rough piece appears common rather than gem grade.