mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale), Color: White to Opaque, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Identified June 30, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to Opaque, Luster: Vitreous to greasy, Crystal structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific gravity: 2.65

Formation & geological history

Formed through the crystallization of silica from hydrothermal solutions or magma. Milky quartz gets its appearance from tiny fluid or gas inclusions trapped during crystal growth. They are found in igneous, metamorphic, and sedimentary environments globally.

Uses & applications

Used in glassmaking, jewelry (as beads or cabochons), electronics for its piezoelectric properties, and as a decorative stone in landscaping and home decor.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by ancient civilizations for stone tools and ritual objects. It is found on every continent and makes up about 12 percent of the Earth's crust.

Field identification & locations

Identify in the field by its hardness (will scratch glass and steel), lack of cleavage, and white opaque color. It is often found in veins within larger rock formations or as water-worn pebbles in stream beds.