mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: 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: White to translucent
Luster: Vitreous to greasy

Identified May 7, 2026More mineral →

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: White to translucent; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins or as a late-stage crystallization in igneous rocks like granite. The white color is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative stones, pocket stones, or in jewelry as cabochons.

Geological facts

Milky Quartz is one of the most common varieties of crystalline quartz on Earth. While less popular for high-end jewelry than clear quartz, it is highly valued in metaphysical circles as a 'wisdom stone'.

Field identification & locations

Identify by its ability to scratch glass, its lack of cleavage, and its characteristic waxy or milky appearance. Found globally, especially in mountain ranges and gravel pits.