Milky Quartz (Vein Quartz)

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white to grey with iron staining; Luster: Vitreous (glassy) to greasy; Crystal Structure: Hexagonal (trigonal); Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes where mineral-rich hot water fills rock fractures and cools. Can be found in igneous, metamorphic, and sedimentary environments across all geological ages.

Uses & Applications

Used as an abrasive, in glassmaking, as a gemstone (when high quality), in electronics (due to piezoelectric properties), and as landscaping stone.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. The 'milky' appearance is caused by tiny fluid inclusions of gas and/or liquid trapped during crystal growth.

Field Identification & Locations

Identify by its hardness (it will easily scratch glass), its lack of cleavage, and its characteristic waxy/glassy luster. It is common in riverbeds, mountains, and as 'veins' in host rocks like granite or shale.

Identified on: 4/27/2026

Mode: Standard