Quartz (Vein Quartz)

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent; Luster: Vitreous to greasy on fracture surfaces; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & Geological History

Formed from hydrothermal solutions as hot, silica-rich fluids precipitate into cracks or fissures in host rock (forming veins). It can be found in a wide variety of geological ages and environments, often associated with igneous and metamorphic terrain.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction as an aggregate, and as a decorative stone or gemstone in jewelry (milky quartz or rock crystal).

Geological Facts

Quartz is one of the most abundant minerals in Earth's crust. 'Milky quartz' gets its white color from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and waxy-to-glassy appearance. This specific specimen appears to be a water-worn or weathered piece of vein quartz, commonly found in riverbeds or near mountain outcroppings.

Identified on: 4/19/2026

Mode: Standard