mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Hardness: 7 on Mohs scale; Color: milky white to off-white with iron staining (buff/orange); Luster: vitreous to greasy; Crystal Structure: trigonal/hexagonal; Cleavage: none (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: milky white to off-white with iron staining (buff/orange)
Luster: vitreous to greasy

Identified July 18, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins or as a primary constituent of igneous and metamorphic rocks. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used as a source of silica for glass and ceramics, as an abrasive, and in landscaping or construction aggregate. Occasional use in jewelry or as a decorative stone.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is often found in massive vein deposits and is sometimes associated with gold deposits.

Field identification & locations

Identify in the field by its hardness (scratches glass), lack of cleavage, and white color. Found globally in a wide variety of geological environments, including riverbeds and mountains.