mineral

Quartz (Milky/Vein Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal (though massive in this specimen); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65.

Hardness: 7 on Mohs scale
Color: Milky white to translucent
Luster: Vitreous (glassy) to greasy

Identified March 8, 2026More mineral →

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Physical properties

Formation & geological history

Formed through the cooling of silica-rich magma or from hydrothermal veins where hot, mineral-rich water precipitates quartz in rock fractures. It can be found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & applications

Used in glass making, abrasive manufacturing, electronics (due to piezoelectric properties), and as an gemstone/ornamental stone. In construction, it is a primary component of concrete and mortar when ground into sand.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is clear (Rock Crystal), but internal fractures and microscopic inclusions of gas or liquids give Milky Quartz its characteristic white, cloudy appearance.

Field identification & locations

Identify in the field by its ability to scratch glass (hardness 7) and its lack of cleavage planes. Found globally in riverbeds, mountains, and outcroppings. Collectors look for well-formed crystals or specimens with interesting inclusions.