mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Off-white/Gray/Translucent; Luster: Vitreous to dull (weathered); Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Off-white/Gray/Translucent
Luster: Vitreous to dull (weathered)

Identified May 10, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Off-white/Gray/Translucent; Luster: Vitreous to dull (weathered); Crystal structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed from cooling magma or hydrothermal veins. This specific specimen is likely water-worn or mechanically weathered from a larger quartz vein, often found in alluvial deposits or glacial till.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as construction aggregate. Smooth pebbles are often used in landscaping or as pocket stones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz' and is highly resistant to chemical and physical weathering.

Field identification & locations

Identify by its hardness (will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and soil. To identify, look for a waxy or glassy luster underneath the weathered exterior.