mineral

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: White to opaque with reddish-brown staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: White to opaque with reddish-brown staining
Luster: Vitreous to greasy

Identified February 25, 2026More mineral →

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Physical properties

Formation & geological history

Formed via hydrothermal activity where silica-rich fluids cool in veins and cavities within the Earth's crust; frequently associated with igneous and metamorphic environments.

Uses & applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and as decorative garden stones or beginner collector specimens.

Geological facts

Quartz is the second most abundant mineral in the Earth's continental crust; the white color in milky quartz is caused by tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field identification & locations

Identified by its ability to scratch glass and its lack of cleavage. Look for it in quartz veins, mountain regions, or riverbeds. Collectors should look for distinct crystal faces or interesting mineral associations.

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