mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White to translucent with tan/orange iron staining; Luster: Vitreous to greasy; Crystal Structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to translucent with tan/orange iron staining
Luster: Vitreous to greasy

Identified June 13, 2026More mineral →

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Physical properties

Formation & geological history

Forms 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. Can be found in geological formations of almost any age.

Uses & applications

Used in glassmaking, as an abrasive, in the electronics industry for its piezoelectric properties, in construction as aggregate, and as decorative landscaping stone.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Milky quartz is often found in gold-bearing hydrothermal veins and is used by prospectors as an indicator mineral.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel blade), lack of cleavage, and translucent white appearance. It is found globally in many environments including mountains, river beds, and beaches.