mineral
Tumbled quartz-rich pebble
Quartz, silicon dioxide (SiO₂), likely milky or included quartz
AI-generated identification · may be incorrectHardness 7 Mohs; translucent gray-white to brownish, vitreous-to-waxy luster, irregular granular texture, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. Rounded edges indicate natural water wear or tumbling.
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Physical properties
Hardness 7 Mohs; translucent gray-white to brownish, vitreous-to-waxy luster, irregular granular texture, no obvious cleavage, conchoidal fracture, and specific gravity about 2.65. Rounded edges indicate natural water wear or tumbling.
Formation & geological history
Likely formed in silica-rich igneous or metamorphic veins and later released by weathering and transported in a stream or glacial deposit; its precise geological age cannot be determined visually.
Uses & applications
Common quartz is used in glass, ceramics, abrasives, electronics, and ornamental stone; attractive polished pieces are sold as inexpensive lapidary specimens.
Geological facts
The cloudy appearance commonly results from microscopic fluid inclusions, fractures, or dispersed minerals. Quartz is one of Earth’s most abundant and chemically durable minerals.
Field identification & locations
Identify it by its glassy luster, lack of cleavage, conchoidal fracture, and ability to scratch ordinary glass; a steel file will not scratch it. Common worldwide, especially in stream gravels and quartz veins.
