mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Opaque white to translucent
Luster: Vitreous to greasy

Identified July 7, 2026More mineral →

Explore Milky Quartz in the encyclopedia →

Identify your own rocks.

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

App Store Google Play

Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal solutions or as a primary constituent of igneous rocks like granite. Its white color is caused by millions of tiny fluid inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, construction aggregate, landscaping, as an abrasive, and sometimes in low-cost jewelry or spiritual healing collections.

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures to create tools and arrowheads when flint was unavailable due to its sharp conchoidal fracture.

Field identification & locations

Identify in the field by its ability to scratch glass, its milky waxy appearance, and lack of cleavage planes. Found globally in veins and as pebbles in riverbeds.