mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to greyish-brown; Luster: Vitreous to greasy; Crystal Structure: Trigonal (often massive in pebbles); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent white to greyish-brown
Luster: Vitreous to greasy

Identified July 13, 2026More mineral →

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Physical properties

Formation & geological history

Formed from hydrothermal veins or within igneous and metamorphic rocks. This specific specimen has been rounded and smoothed by water erosion in a river or coastal environment over thousands of years.

Uses & applications

Primarily collected as a common nature find; high-purity quartz is used in glassmaking, electronics (silicon chips), and as an abrasive.

Geological facts

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

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. It is found globally in riverbeds, beaches, and soil. Collectors often find these as 'lucky stones' or use them for tumbling projects.