mineral

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent
Luster: Vitreous to greasy

Identified July 17, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed in hydrothermal veins or as a primary constituent in igneous rocks like granite. This specific specimen has been weather-worn into a smooth pebble shape through fluvial or coastal erosion.

Uses & applications

Used in glass manufacturing, as an abrasive, in electronics (piezoelectric properties), landscaping, and as a pocket stone for collectors.

Geological facts

Milky quartz gets its cloudy white appearance from tiny fluid or gas inclusions trapped during the crystal's growth. It is one of the most common minerals found on the Earth's crust.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), white color, and lack of cleavage. Commonly found in riverbeds, beaches, and mountain trails everywhere.