Quartz (Milky or White Quartz)

Physical Properties

Hardness: 7 on Mohs scale; Color: Colorless to white/milky; Luster: Vitreous (glassy) to greasy; Crystal structure: Hexagonal/Trigonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed in a wide range of geological environments, most commonly from the cooling of magma or hydrothermal veins. It is found in igneous, metamorphic, and sedimentary rocks of all ages.

Uses & Applications

Used in glass making, abrasive materials, electronics (due to piezoelectric properties), construction as aggregate, and as a semi-precious gemstone in jewelry.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is known as rock crystal, while the milky appearance seen here is caused by microscopic fluid inclusions of gas or liquid trapped during crystal growth.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. It is often found in riverbeds or as veins in mountain ranges. Collectors look for well-defined crystal terminations.

Identified on: 4/23/2026

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