mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white
Luster: Vitreous to greasy

Identified June 7, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white; Luster: Vitreous to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal fluids in veins or as a constituent of igneous rocks. The milky color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, ceramics, abrasives, and as a semi-precious gemstone in jewelry or decorative items. Also used in construction as aggregate and in the electronics industry for its piezoelectric properties.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in massive form rather than distinct crystals. In many cultures, it was referred to as 'Snow Quartz'.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and translucent to opaque white appearance. Commonly found in riverbeds, mountain ranges, and within quartz veins inside host rocks.