mineral
Tumbled quartz or pale agate pebble
Quartz (SiO₂), possibly microcrystalline chalcedony
AI-generated identification · may be incorrectSmall rounded, polished specimen with cream-white color, translucent edges, and a dull to waxy luster; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The visible dark markings may be iron-oxide inclusions or surface staining.
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Physical properties
Small rounded, polished specimen with cream-white color, translucent edges, and a dull to waxy luster; quartz hardness is Mohs 7, with no cleavage and conchoidal fracture. The visible dark markings may be iron-oxide inclusions or surface staining.
Formation & geological history
Likely natural quartz or chalcedony that was weathered and then mechanically tumbled or polished; quartz formed in silica-rich veins, cavities, or sedimentary environments over various geological ages. Exact identification requires a closer view and testing.
Uses & applications
Commonly sold as a decorative tumbled stone, craft material, or inexpensive beginner’s mineral specimen; quartz is also important in glassmaking, electronics, abrasives, and engineered stone.
Geological facts
Quartz is one of Earth’s most abundant minerals and has a trigonal crystal structure, although tumbled pieces usually show no crystal faces.
Field identification & locations
Identify quartz by its glassy-to-waxy appearance, lack of cleavage, conchoidal fracture, and ability to scratch glass; chalcedony is typically more uniformly waxy and opaque. Common sources include Brazil, Madagascar, the United States, and worldwide gravel deposits.
