mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: White, often stained with yellow or orange iron oxides; Luster: Vitreous to greasy; Crystal Structure: Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: White, often stained with yellow or orange iron oxides
Luster: Vitreous to greasy

Identified March 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed from the crystallization of silica-rich hydrothermal solutions in veins or as a major constituent in igneous and metamorphic rocks. Milky appearance is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used widely in glassmaking, abrasives, and as a component in concrete and mortar. Higher quality specimens are used for decorative landscaping, jewelry (as cabochons), and metaphysical collecting.

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 and is frequently the 'host rock' for hydrothermal gold deposits.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), white streak, and lack of cleavage. Look for it along riverbeds, road cuts in granite-rich areas, and as white 'veins' in darker rock. It is ubiquitous globally.