mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

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

Hardness: 7 on Mohs scale
Color: Cloudy white to pale yellowish
Luster: Vitreous to greasy

Identified March 25, 2026More mineral →

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Physical properties

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

Formation & geological history

Formed through the cooling of magma or by precipitation from hydrothermal veins. The milky appearance is caused by tiny inclusions of gas or liquid trapped during crystal growth. Can be found in geological formations ranging from billions of years old to relatively recent.

Uses & applications

Commonly used in glassmaking, abrasives, and as a source of silicon for electronics. In larger, clearer specimens, it is used for lapidary work, jewelry, and metaphysical collecting.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz is the most common variety of quartz found globally. Historic cultures often used it to craft tools and arrowheads due to its conchoidal fracture which creates sharp edges.

Field identification & locations

Identify in the field by its ability to scratch glass (hardness 7) and its lack of cleavage. It is found globally in igneous, metamorphic, and sedimentary environments, often occurring as pebbles in stream beds or as veins in granite bedrock.