Rock Identifier
Tumbled brown stone, likely jasper or iron-stained quartz (Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions) — mineral
mineral

Tumbled brown stone, likely jasper or iron-stained quartz

Microcrystalline quartz (SiO₂), possibly chalcedony/jasper with iron-oxide inclusions

AI-generated identification · may be incorrect

Opaque brown to golden-brown, dull to slightly waxy luster, rounded from tumbling or natural abrasion; quartz hardness is about 7 Mohs, with no obvious cleavage and conchoidal fracture. The small size and image lighting prevent confident distinction from brown chert or another common siliceous pebble.

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Physical properties

Opaque brown to golden-brown, dull to slightly waxy luster, rounded from tumbling or natural abrasion; quartz hardness is about 7 Mohs, with no obvious cleavage and conchoidal fracture. The small size and image lighting prevent confident distinction from brown chert or another common siliceous pebble.

Formation & geological history

Likely formed when silica-rich groundwater deposited cryptocrystalline quartz, later colored by hematite or limonite; such material can range from ancient sedimentary deposits to younger weathering gravels. The specimen appears polished or naturally water-worn rather than freshly broken.

Uses & applications

Used as inexpensive decorative stone, cabochons, beads, tumbled stones, and lapidary material; ordinary pieces have little industrial or jewelry value.

Geological facts

Jasper and chert are varieties of opaque chalcedony, while iron oxides produce the yellow, red, and brown coloration. A steel file generally will not scratch quartz, but glass can be scratched by it.

Field identification & locations

Common in river gravels and silica-rich volcanic or sedimentary terrains worldwide, including the western United States, Brazil, India, and Australia. Confirm with a hardness test, streak (usually white), and close inspection for cryptocrystalline texture.