mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 (Mohs scale); Color: White to cream, opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White to cream, opaque
Luster: Vitreous to greasy

Identified June 25, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale); Color: White to cream, opaque; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; 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 fluid or gas inclusions trapped during crystal growth.

Uses & applications

Used in construction as a source of silica, in glassmaking, and as an abrasive. Polished pieces are used in decorative items, lapidary projects, and tumbling for beginners.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz and can host gold in certain vein deposits.

Field identification & locations

Identify in the field by its hardness (will scratch glass), lack of cleavage, and waxy luster. Commonly found in riverbeds, mountains, and as garden stones.