mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous (glassy) to greasy

Identified April 12, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal solutions in veins or during the cooling of igneous magmas. The milky color is caused by tiny inclusions of gas or liquid trapped during crystal growth. They can be found in geological environments ranging from Precambrian to Cenozoic.

Uses & applications

Used in glassmaking, abrasives, electronics (due to piezoelectric properties), and as decorative landscaping stone or semi-precious gemstones in jewelry.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in large 'bull quartz' veins that can span miles. It is the primary component of most white beach sands after physical weathering.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), white color, and lack of cleavage. Often found in riverbeds as rounded pebbles or as jagged outcroppings in mountainous regions.