mineral

Milky 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 May 30, 2026More mineral →

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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 from the crystallization of silica-rich hydrothermal fluids in veins or as a major constituent of igneous rocks like granite. Its milky appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative landscaping stone or semi-precious gemstones (cabochons).

Geological facts

Milky quartz is the most common variety of crystalline quartz. Historically, it was used by many cultures for stone tools when flint was unavailable. It is often found associated with gold in hydrothermal vein deposits.

Field identification & locations

Identify in the field by its white color, inability to be scratched by steel, and lack of cleavage. It is found globally in almost all geological environments, particularly in riverbeds and mountainous terrain.