mineral

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Hardness: 7 (Mohs scale); Color: White, translucent to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal (hexagonal in appearance); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 (Mohs scale)
Color: White, translucent to milky
Luster: Vitreous to greasy

Identified April 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the crystallization of molten magma or from hydrothermal vents. It can also be found in sedimentary clusters or as a metamorphic rock called quartzite. It is found in all geological ages.

Uses & applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), construction as an aggregate, and in its pure forms as gemstones or for ornamental carvings.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is traditionally called rock crystal, but when it contains microscopic fluid inclusions, it takes on a 'milky' white appearance.

Field identification & locations

Identify in the field by its hardness (it will scratch glass), its lack of cleavage, and its waxy or vitreous luster. Commonly found in riverbeds, mountain ranges, and as large veins in igneous rocks.

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Mineral/Rock

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Metamorphic Rock

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