mineral

Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent gray-white with darker inclusions; Luster: Vitreous (glassy) to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent gray-white with darker inclusions
Luster: Vitreous (glassy) to waxy

Identified May 21, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The rounded shape indicates high-energy water transport (stream or beach erosion) that occurred over thousands of years.

Uses & applications

Commonly used in landscaping (pea gravel), glass manufacturing, and as abrasive media. High-quality specimens are used in jewelry as semi-precious gemstones.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which means 'hard'.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till. Collectors often look for clarity or interesting vein patterns.