mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Translucent white to milky
Luster: Vitreous (glassy) to greasy

Identified May 21, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in hydrothermal veins or as a late-magmatic mineral in pegmatites. It is found in a wide variety of geological environments ranging from igneous to metamorphic belts throughout geological time.

Uses & applications

Used in glassmaking, as an abrasive, in the production of silicon chips (electronics), as gravel for construction, and as decorative landscaping stone or tumbled gemstones.

Geological facts

The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Quartz is one of the most abundant minerals in the Earth's crust.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and translucent white color. Commonly found in riverbeds, mountains, and mining sites worldwide. It is a fundamental mineral for rock collectors.