mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

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

Identified May 31, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed from the cooling of silica-rich magma or through hydrothermal activity where fluid-filled cavities allow crystals to grow from solution. Milky quartz specifically gets its appearance from tiny fluid or gas inclusions trapped during crystal growth.

Uses & applications

Used in glassmaking, as an abrasive, in the production of silicon metal, as a gemstone for jewelry, and in quartz countertops or construction aggregate.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust. Milky quartz is often the most common variety found in quartz veins and can sometimes contain hidden traces of gold.

Field identification & locations

Identify in the field by its ability to scratch glass, its translucent white appearance, and lack of cleavage (it breaks in irregular, jagged curves). Commonly found in igneous outcrops or as pebbles in riverbeds.