mineral
Tumbled quartz-rich pebble
Quartz (SiO₂), possibly iron-stained milky quartz or quartzite
AI-generated identification · may be incorrectCream to honey-brown, opaque, and smoothly rounded with a dull to waxy luster; likely Mohs hardness 7, no visible cleavage, and a granular or microcrystalline texture. The brown coloration is probably from iron-oxide staining.
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Physical properties
Cream to honey-brown, opaque, and smoothly rounded with a dull to waxy luster; likely Mohs hardness 7, no visible cleavage, and a granular or microcrystalline texture. The brown coloration is probably from iron-oxide staining.
Formation & geological history
Likely natural stream or beach abrasion, or mechanical tumbling; quartz formed in igneous, metamorphic, or hydrothermal rocks, commonly hundreds of millions to billions of years old. The image alone cannot distinguish quartz from quartzite confidently.
Uses & applications
Used as aggregate, glass and ceramic raw material, abrasives, and decorative stone; attractive pieces are used in crafts and lapidary work. This specimen appears common and has little commercial value.
Geological facts
Quartz is one of Earth’s most abundant minerals and is highly resistant to weathering, allowing it to survive as rounded pebbles after softer minerals erode.
Field identification & locations
Look for hardness sufficient to scratch ordinary glass, lack of cleavage, and a white streak; quartzite may show interlocking grains, while quartz can show translucent edges and conchoidal fracture. Common worldwide in river gravels, beaches, veins, and quartz-rich rocks.
