mineral

Milky Quartz

Silicon Dioxide (SiO2)

AI-generated identification · may be incorrect

Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

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

Identified July 15, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to cream; Luster: Vitreous to greasy; Crystal structure: Trigonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins within igneous, metamorphic, or sedimentary rocks. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth.

Uses & applications

Used in glassmaking, abrasives, precision electronics (piezoelectric properties), and as decorative landscape stone or lapidary material.

Geological facts

Quartz is one of the most abundant minerals on Earth's crust. Milky quartz specifically is common because the 'milkiness' is the result of minute bubbles of gas and water trapped when the crystal was forming.

Field identification & locations

Identify by its hardness (cannot be scratched by a steel knife), white color, and lack of cleavage. Look for it in riverbeds, mountain veins, or as pebbles in gravel deposits worldwide.