mineral

Milky Quartz (with Iron Oxide staining)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale. Color: White to opaque (milky), with reddish-brown staining from limonite or hematite. 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 24, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of silica-rich hydrothermal fluids in veins or as a primary mineral in igneous rocks like granite. Its 'milky' appearance is caused by microscopic inclusions of fluids and gases trapped during crystal growth.

Uses & applications

Used in glass manufacturing, as an abrasive, in the production of silicon for electronics, and widely as decorative gravel, gemstones, or metaphysical specimens.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear (Rock Crystal), but milky quartz is the most common variety found in nature due to the frequency of inclusions.

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 commonly found in mountain ranges, creek beds, and near granite outcrops globally.

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