sedimentary

Banded chert (jasper-like chert)

Microcrystalline quartz (SiO₂), likely iron-oxide-stained chert

AI-generated identification · may be incorrect

Opaque cream, rust-red, and tan bands with a dull to slightly waxy luster and irregular fracture; quartz hardness is about 7 Mohs, with no cleavage. The photo does not show enough detail to confirm the exact variety or composition.

Identified October 3, 2026More sedimentary →

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Physical properties

Formation & geological history

Forms when silica-rich sediment or chemical precipitates lithify and recrystallize into microcrystalline quartz; iron oxides can create red coloration. Such rocks occur across many geological ages and settings.

Uses & applications

Commonly cut, polished, or tumbled for ornaments and lapidary work; chert has also been used historically for sharp tools.

Geological facts

Chert varieties can resemble jasper, but jasper is typically more uniformly opaque and strongly colored.

Field identification & locations

Look for hardness, conchoidal fracture, and a waxy surface; it may scratch glass. Similar chert and jasper occur worldwide, but visual identification alone cannot establish the variety.