mineral

Iron-stained quartz pebble

Quartz (SiO₂), likely limonite/goethite-stained

AI-generated identification · may be incorrect

Hardness 7 Mohs; translucent white to pale gray with rusty-brown iron-oxide patches, vitreous to dull luster, no obvious cleavage, and conchoidal fracture. The rounded shape indicates natural abrasion or tumbling.

Identified September 2, 2026More mineral →

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Physical properties

Formation & geological history

Quartz crystallized from silica-rich igneous or hydrothermal fluids; later weathering deposited iron oxides on fractures and surfaces. Its exact geological age and source cannot be determined from the photograph.

Uses & applications

Common quartz is used in glass, ceramics, abrasives, engineered stone, and electronics; attractive pieces are inexpensive display specimens. It is generally not gem quality.

Geological facts

Rust-colored staining commonly consists of limonite or goethite rather than iron within the quartz crystal lattice. Translucency and the absence of cleavage help distinguish quartz from feldspar.

Field identification & locations

Look for glassy luster, conchoidal fracture, high scratch resistance, and inability to scratch quartz with a steel knife; an unglazed ceramic tile may show a white streak. Quartz pebbles occur widely in stream gravels, soils, and weathered rock deposits.