mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7; Color: White to pale green/gray; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7
Color: White to pale green/gray
Luster: Vitreous to greasy

Identified June 6, 2026More mineral →

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Physical properties

Hardness: 7; Color: White to pale green/gray; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used as an abrasive, in glassmaking, as a gemstone in jewelry, and in the production of silicon chips and watches (piezoelectric properties).

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in massive form rather than distinct crystals.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and waxy luster. Common in mountainous regions, riverbeds, and gravel pits worldwide.