mineral

Milky Quartz Pebble

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white with tan/iron staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal (cryptocrystalline in this water-worn state); Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white with tan/iron staining
Luster: Vitreous to waxy

Identified June 8, 2026More mineral →

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Physical properties

Formation & geological history

Forms from secondary hydrothermal solutions or the cooling of silica-rich magma; this specimen's rounded shape indicates it was weathered and transported by water in a river or coastal environment.

Uses & applications

Used in glassmaking, electronics, silicon production, and as an abrasive. Polished pebbles are popular for landscaping and decorative floral arrangements.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its opaque white color from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds, beaches, and glacial till worldwide. Look for the characteristic waxy 'white stone' appearance.