mineral

Small brown quartz-rich pebble, possibly chert or jasper

Microcrystalline quartz (SiO₂), tentative

AI-generated identification · may be incorrect

Brown, opaque to slightly translucent, with a dull to weakly vitreous luster and irregular angular faces. Quartz hardness is about 7 Mohs; no obvious cleavage. The photograph is insufficient to distinguish chert/jasper from weathered quartz or another brown silicate.

Identified August 26, 2026More mineral →

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Physical properties

Formation & geological history

Likely formed by silica crystallization in sedimentary rock or as a weathered vein fragment. Chert and jasper commonly form during sediment alteration or silica-rich fluid deposition; age cannot be determined visually.

Uses & applications

Small pieces are mainly collector specimens; attractive jasper or agate may be tumbled, cabbed, or used in inexpensive jewelry. Chert is also used historically for tools and occasionally as aggregate.

Geological facts

A steel file or glass-scratch test can help: quartz-rich material should scratch ordinary glass, though testing may damage it. A streak test, translucency check, and magnifier examination would improve identification.

Field identification & locations

The reported Tuzla-area location is geologically plausible for brown chert, jasper, quartz, and weathered sedimentary fragments. Common regional possibilities include chert from sedimentary units or iron-stained quartz; a definitive name requires hardness, streak, and closer texture inspection.