mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to cream with orange/iron staining, Luster: Vitreous to greasy, Crystal structure: Trigonal, Cleavage: None (Conchoidal fracture), SG: 2.65

Identified April 22, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to cream with orange/iron staining, Luster: Vitreous to greasy, Crystal structure: Trigonal, Cleavage: None (Conchoidal fracture), SG: 2.65

Formation & geological history

Formed from hydrothermal solutions or by the cooling of magma in veins. Often found in pegmatites. This specific specimen appears to be water-worn, smoothed by alluvial or river transport.

Uses & applications

Used in the production of glass, ceramics, and microchips. As a gemstone, it is used for beads and carvings. Also highly valued as a decorative landscape stone.

Geological facts

Milky quartz gets its white, 'milky' appearance from millions of microscopic fluid inclusions of gas or liquid trapped during crystal growth. It is the most common variety of crystalline quartz.

Field identification & locations

Identify by its hardness (it will scratch glass) and lack of cleavage. Commonly found in riverbeds and mountainous regions globally. Look for smooth, semi-translucent pebbles with a waxy texture.