sedimentary

Tumbled chert or jasper nodule

Microcrystalline quartz (SiO₂), likely iron-stained chert/jasper

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; pale pink-beige with rusty orange-brown veining and fractures; dull to subtly waxy luster; cryptocrystalline quartz with no visible cleavage. The rounded shape appears naturally water-worn or deliberately tumbled.

Identified August 17, 2026More sedimentary →

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Physical properties

Formation & geological history

Likely formed when silica-rich groundwater replaced or filled cavities in sediment, later becoming iron-stained and fractured. Chert and jasper commonly range from Paleozoic to Cenozoic in age; the Antalya-area region near 36.4°N, 32.2°E has abundant sedimentary rocks and likely siliceous pebbles.

Uses & applications

Used as decorative stone, lapidary rough, tumbled stone, and occasionally for low-grade cabochons or beads; not typically used structurally as an isolated pebble.

Geological facts

The rusty colors result mainly from iron oxides such as hematite and limonite. A steel file or knife should barely scratch it, while quartz or a streak test can help confirm it.

Field identification & locations

Identify by its very fine texture, waxy/dull surface, conchoidal fracture, and lack of distinct grains or cleavage. Common in stream gravels and weathered limestone terrains; it could also be silicified limestone rather than true jasper.