mineral

Milky Quartz

Silicon Dioxide (SiO2)

Mohs hardness: 7. Color: Opaque white to translucent cream. Luster: Vitreous to greasy. Crystal structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Hardness: 7
Color: Opaque white to translucent cream
Luster: Vitreous to greasy

Identified July 8, 2026More mineral →

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Physical properties

Mohs hardness: 7. Color: Opaque white to translucent cream. Luster: Vitreous to greasy. Crystal structure: Hexagonal (trigonal). Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Formation & geological history

Forms in hydrothermal veins or as a primary constituent in igneous rocks like granite. Its milky appearance is caused by tiny liquid or gas inclusions trapped during crystal growth.

Uses & applications

Used as a gemstone in tumbled or cabochon form, as an abrasive, in glass making, and as a source of silicon for electronic components. Popular for decorative landscaping and metaphysical collecting.

Geological facts

Milky Quartz is the most common variety of crystalline quartz. While often overlooked for clearer varieties, it represents a significant portion of the Earth's crustal minerals. Large boulders can weigh several tons.

Field identification & locations

Identify in the field by its waxy luster, lack of cleavage, and ability to scratch glass. Found globally, especially in mountain ranges and riverbeds where it survives as water-worn pebbles.