mineral

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to pale tan; Luster: Vitreous to waxy; Crystal Structure: Trigonal (though rounded here); Cleavage: None (conchoidal fracture).

Hardness: 7 on Mohs scale
Color: Translucent white to pale tan
Luster: Vitreous to waxy

Identified July 21, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent white to pale tan; Luster: Vitreous to waxy; Crystal Structure: Trigonal (though rounded here); Cleavage: None (conchoidal fracture).

Formation & geological history

Formed through hydrothermal processes or igneous crystallization, then subsequently weathered and smoothed by water action in a river, stream, or beach environment over thousands of years.

Uses & applications

Collecting, decorative vase filler, landscaping, or as a source of silica in glass manufacturing if found in high purity/volume.

Geological facts

Quartz is one of the most abundant minerals on Earth. River-tumbled pebbles like this one are nature's version of a rock tumbler, creating smooth surfaces through constant friction with water and silt.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Common in alluvial deposits worldwide. Look for a translucent 'glow' when held against light.