mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan due to microscopic fluid inclusions; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich hydrothermal veins or within pegmatites. It is the most common variety of crystalline quartz and can be found in geological formations ranging from the Precambrian to recent times.

Uses & applications

Used as an abrasive in sandpaper, in the manufacturing of glass and ceramics, as a flux in metallurgy, and as decorative gravel or gemstones in costume jewelry.

Geological facts

The 'milky' appearance is caused by tiny bubbles of gas or liquid trapped during the crystal's growth. Historically, it was used by many ancient cultures to create stone tools and arrowheads because of its predictable fracture patterns.

Field identification & locations

Identify in the field by its ability to scratch glass, its lack of cleavage, and its waxy or vitreous luster. It is found globally, very commonly in riverbeds, mountain ranges, and within granite outcrops.