mineral

Milky Quartz Pebble (Iron-Stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to cream with orange-yellow iron oxide staining; Luster: Vitreous to waxy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to cream with orange-yellow iron oxide staining
Luster: Vitreous to waxy

Identified March 28, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a major component of igneous rocks like granite. This specific specimen has been water-worn and smoothed in a high-energy environment like a river or beach.

Uses & applications

Used in glassmaking, abrasives, and as decorative landscaping stones. Tumbled pieces are common in beginner rock collections and used as 'worry stones' or in low-cost jewelry.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field identification & locations

Identify in the field by its ability to scratch glass and lack of cleavage. This specimen is a typical 'river rock' found globally in gravel deposits and along shorelines.

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