mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Off-white, milky white, or translucent cream; Luster: Vitreous to greasy; Crystal Structure: Trigonal (often massive in tumbled form); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Off-white, milky white, or translucent cream
Luster: Vitreous to greasy

Identified July 27, 2026More mineral →

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Physical properties

Formation & geological history

Forms in hydrothermal veins, pegmatites, and metamorphic rocks. The milky, opaque white appearance is caused by tiny microscopic fluid inclusions trapped during the crystal growth process.

Uses & applications

Used in tumbled stone collections, lapidary projects, decorative gravel, costume jewelry, and as a raw material for silicon production and glassmaking.

Geological facts

Milky quartz is one of the most abundant minerals found on Earth's crust. Native American cultures often used milky quartz to craft projectile points when flint was unavailable.

Field identification & locations

Identify by its hardness (scratches glass readily), smooth tumbled texture, white to creamy color, and lack of distinct cleavage. Frequently found in riverbeds, gravel deposits, and quartz veins worldwide.