mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: Off-white to yellowish-brown due to iron oxide staining. Luster: Vitreous to dull/earthy when weathered. Cleavage: None (conchoidal fracture). Specific Gravity: ~2.65.

Hardness: 7 on Mohs scale
Color: Off-white to yellowish-brown due to iron oxide staining
Luster: Vitreous to dull/earthy when weathered

Identified July 22, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal solutions or magmatic fluids, followed by erosion, transport, and stream/river rounding over time.

Uses & applications

Used in glassmaking, ceramics, construction aggregate, silicon metal production, and as decorative river stones.

Geological facts

Quartz is one of the most abundant and resistant minerals on Earth's surface, often surviving long-distance river transport while softer minerals wear away completely.

Field identification & locations

Can be identified in the field by its hardness (scratches glass easily, cannot be scratched by a steel knife), lack of cleavage, and smooth rounded pebble morphology from water action. Extremely common worldwide including riverbeds in the Philippines.