mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 (Mohs scale), Color: White to semi-translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified May 27, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to semi-translucent, Luster: Vitreous to greasy, Crystal Structure: Trigonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins, pegmatites, and as a primary mineral in igneous rocks like granite. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, as an abrasive, in electronics (piezoelectric properties), jewelry, and as a decorative stone in landscaping.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Milky quartz is the most common variety of crystalline quartz found in nature.

Field identification & locations

Identify by its hardness (scratches glass), lack of cleavage, and characteristic greasy/waxy luster on broken surfaces. Very common in quartz veins in mountainous regions.