mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Translucent white to milky
Luster: Vitreous to greasy

Identified June 26, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Translucent white to milky; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific Gravity: 2.65

Formation & geological history

Forms in hydrothermal veins, pegmatites, and igneous rocks through the cooling of silica-rich fluids. Generally found in Precambrian to Cenozoic formations depending on the host rock.

Uses & applications

Used in glassmaking, electronics (piezoelectric properties), abrasives, and as a semi-precious gemstone in jewelry and decor.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by microscopic inclusions of fluids or gases trapped during crystal growth.

Field identification & locations

Identify by its ability to scratch glass and lack of cleavage. Often found in riverbeds, mountains, and mining tailings. Look for conchoidal (shell-like) fractures.

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Mineral/Rock

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Metamorphic Rock

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