mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

Hardness: 7 (Mohs scale)
Color: Opaque white to creamy
Luster: Vitreous to greasy

Identified April 6, 2026More mineral →

Identify your own rocks.

Get a report just like this from any photo, free.

App Store Google Play

Physical properties

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

Formation & geological history

Forms in igneous, metamorphic, and sedimentary environments, most often from hydrothermal veins or as a primary constituent of pegmatites. The milky appearance is caused by tiny gas or liquid inclusions trapped during crystal growth.

Uses & applications

Used in glass manufacturing, electronics (piezoelectric properties), abrasives, and occasionally as a decorative landscape stone or in cheap jewelry/beads.

Geological facts

Milky quartz is the most common variety of crystalline quartz. It is often found in massive form rather than distinct crystals. Historically, it has been used by various cultures to make stone tools.

Field identification & locations

Look for a glassy white stone that cannot be scratched by a steel knife and has no visible layers or cleavage planes. Commonly found in riverbeds, mountains, and as garden stones worldwide.