mineral

Milk Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)

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

Identified March 24, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from hydrothermal deposits in veins or pegmatites. It derives its milky appearance from numerous microscopic fluid inclusions (gas or liquid) trapped during crystal growth. Can be found in rocks of any geological age.

Uses & applications

Used in the production of glass, ceramics, and electronics (as a source of silicon). Widely used as a construction aggregate and in landscaping. Lower grades are used for sandpaper/abrasives.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milk quartz is the most common variety of quartz. Some milky quartz veins are 'auriferous,' meaning they hold the primary source of gold in many mining districts.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and white milky color. It is often found as river stones or protruding 'ridges' in eroded hillsides. Common worldwide, especially in metamorphic terrains.

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