Quartz Vein / Milky Quartz

Physical Properties

Hardness: 7 on Mohs scale; Color: Colorless, white, or stained orange/brown by iron oxides; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; 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. This specimen likely formed in a high-pressure environment during mountain-building events or volcanic activity.

Uses & Applications

Used in the electronics industry (semiconductors), glass manufacturing, as an abrasive, and in construction. Massive specimens are used for landscaping or as a source of high-purity silica.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Vein quartz often acts as a 'host rock' for precious metals like gold, which can be deposited within the quartz fractures.

Field Identification & Locations

Identify in the field by its hardness (it will scratch glass), lack of cleavage, and translucent appearance when cleaned. Often found in outcrops where softer surrounding rock has eroded away.

Identified on: 4/21/2026

Mode: Standard