mineral

Milky Quartz

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to off-white, translucent to opaque; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to off-white, translucent to opaque
Luster: Vitreous to greasy

Identified July 15, 2026More mineral →

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Physical properties

Formation & geological history

Formed in hydrothermal veins, pegmatites, and as a primary constituent of many igneous rocks like granite. Its milky appearance is caused by tiny fluid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glass making, ceramics, and as an abrasive in sandpaper. Also used in construction as aggregate and in jewelry as cabochons or beads.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is specifically notable because its opacity is due to microscopic 'bubbles' of liquid or gas from when the mineral was forming.

Field identification & locations

Identify by its hardness (it will scratch glass), lack of cleavage, and white waxy appearance. Commonly found in riverbeds, mountains, and gardens worldwide.