mineral

Milky Quartz

Silicon Dioxide (SiO2)

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

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

Identified February 19, 2026More mineral →

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Physical properties

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

Formation & geological history

Forms in igneous, metamorphic, and sedimentary environments. Most commonly crystallizes from hydrothermal veins or cools within magma-rich pegmatites. It is found in geological formations of all ages, from Precambrian to Cenozoic.

Uses & applications

Used in the production of glass, ceramics, and sandpaper. Often used as decorative gravel, in landscaping, or as a semi-precious gemstone in low-cost jewelry and lapidary work.

Geological facts

Milky quartz gets its cloudy white appearance from tiny fluid or gas inclusions trapped during the crystal's growth. It is one of the most common mineral varieties on the Earth's crust.

Field identification & locations

Identify in the field by its ability to scratch glass, its white 'milky' opacity, and lack of cleavage planes. Found globally in riverbeds, mountains, and mines. Collectors often look for pieces with attached host rock or unique pyramidal terminations.