mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

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

Identified June 17, 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: Opaque white to creamy; 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-rich hydrothermal veins or within igneous pegmatites. The white color is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, as an abrasive, in electronics for its piezoelectric properties, and commonly as decorative landscaping stone or in costume jewelry.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. It can sometimes contain minute amounts of gold in hydrothermal vein deposits, making it a target for prospectors.

Field identification & locations

Identify by its ability to scratch glass, its milky opacity, and lack of cleavage planes. It is found globally in almost every geological environment, particularly in mountain ranges and riverbeds.