mineral

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudy white to grayish
Luster: Vitreous (glassy) to greasy

Identified June 27, 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: Cloudy white to grayish; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins and pegmatites when silica-rich fluids cool and crystallize. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in geological formations across all ages.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, as an abrasive, and in landscaping or decorative home decor.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. It can sometimes contain trace amounts of gold within its veins in certain geological regions.

Field identification & locations

Identify by its hardness (will scratch glass), lack of cleavage, and translucent white color. It is commonly found in riverbeds, mountain ranges, and near granite outcrops globally. collectors should look for distinct crystal faces.