mineral

Weathered quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly chert or chalcedony

AI-generated identification · may be incorrect

Pale yellow-tan, fine-grained and opaque to slightly translucent, with a dull/waxy luster and rounded weathering. Quartz hardness is about 7 Mohs; no visible cleavage, conchoidal fracture, and specific gravity near 2.65.

Identified September 13, 2026More mineral →

Explore Weathered quartz-rich pebble in the encyclopedia →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

Formation & geological history

Likely a naturally weathered silica-rich fragment, formed from microcrystalline quartz during sedimentary silicification or volcanic hydrothermal activity; its exact geological age cannot be determined from the photograph.

Uses & applications

Common material for decorative pebbles, lapidary carving, tumbling, and occasional low-grade gemstone use; not suitable for major construction identification from this specimen alone.

Geological facts

The yellow coloration may result from iron-oxide staining or finely distributed impurities. A steel file should not scratch quartz, while quartz can scratch ordinary glass.

Field identification & locations

Common in gravel beds and weathered outcrops worldwide, especially regions containing chert, agate, or quartz veins. Confirm with a hardness test, streak test, and inspection for waxy texture or conchoidal fractures.