rock

Tumbled brown jasper / iron-rich breccia

Microcrystalline quartz (SiO₂), likely with iron oxides and assorted silicate fragments

AI-generated identification · may be incorrect

Hardness about 6.5–7 Mohs; opaque brown, gold, gray, and black coloration; dull to waxy luster when polished; no visible cleavage; fine-grained, heterogeneous texture and typical silica-rich density around 2.6 g/cm³.

Identified September 14, 2026More rock →

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Physical properties

Formation & geological history

Likely silica-rich sedimentary or hydrothermal material later cemented and stained by iron oxides, then rounded by tumbling; exact geological age and locality cannot be determined from the image.

Uses & applications

Used as a decorative stone, lapidary cabochon, polished pebble, and inexpensive collector specimen; not generally used as an architectural stone in this small form.

Geological facts

The brown and golden colors commonly come from hematite, goethite, or limonite, while gray translucent areas may be chalcedony or quartz. “Jasper” is a trade and field term for opaque, silica-rich chalcedony/quartz aggregates.

Field identification & locations

Identify by its opaque, nonmetallic appearance, glassy-to-waxy polish, lack of cleavage, and resistance to scratching; a steel file should generally scratch less readily than the specimen. Similar material occurs worldwide, especially in volcanic and hydrothermal regions.