mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, translucent to milky; Luster: Vitreous/waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, translucent to milky
Luster: Vitreous/waxy

Identified July 7, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White, translucent to milky; Luster: Vitreous/waxy; Crystal structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. These specific specimens are water-worn river pebbles shaped by erosion over thousands of years.

Uses & applications

Used in glass manufacturing, electronics, jewelry (as semi-precious stones), and as decorative landscaping gravel.

Geological facts

Quartz is one of the most abundant minerals on Earth's crust. It is piezoelectric, meaning it can generate an electric charge when mechanical pressure is applied.

Field identification & locations

Identify by its hardness (scratches glass), translucent appearance, and lack of cleavage. Common in riverbeds, beaches, and glaciated plains worldwide.