mineral

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Opaque white to creamy tan
Luster: Vitreous to waxy

Identified March 29, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Opaque white to creamy tan; Luster: Vitreous to waxy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Formation & geological history

Forms in hydrothermal veins or as a major constituent of igneous rocks like granite. The white color is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can form across all geological ages from billions of years ago to relatively recently.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction as an abrasive or aggregate, and in tumbled jewelry or home decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz specifically gets its 'cloudy' appearance from microscopic fluid inclusions that scatter light.

Field identification & locations

Identify in the field by its hardness (it can scratch glass and steel) and lack of cleavage. It is found globally, very common in riverbeds, mountains, and veins within host rocks like granite or slate.