mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 (Mohs scale), Color: White to pale yellowish-cream, Luster: Vitreous to greasy, Crystal structure: Trigonal (Hexagonal), Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Identified July 8, 2026More mineral →

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Physical properties

Hardness: 7 (Mohs scale), Color: White to pale yellowish-cream, 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 fluids in veins or as a late-stage mineral in igneous pegmatites. The milky appearance is caused by tiny inclusions of gas and liquid trapped during crystal growth.

Uses & applications

Used in glass manufacturing, construction as a base material, abrasives, and as a low-cost ornamental stone or landscaping rock.

Geological facts

Milky quartz is the most common variety of crystalline quartz. While it lacks the clarity of rock crystal, it can contain traces of gold in hydrothermal vein deposits.

Field identification & locations

Identify in the field by its characteristic waxy luster and inability to be scratched by a steel knife. It is found globally, particularly in mountainous regions and riverbeds.