Milky Quartz with Iron Inclusions

Physical Properties

Hardness: 7 on Mohs scale; Color: Milky white with reddish-brown iron staining; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes where silica-rich fluids cool in veins and cavities within various rock types. The reddish tint comes from later oxidation of iron minerals like hematite or goethite.

Uses & Applications

Silicon used in microchips and solar cells, abrasive material, quartz crystals for watches/electronics, and popular as cabinet specimens for collectors.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'quarz', which originally meant 'hard'.

Field Identification & Locations

Identified by its hardness (can scratch glass), lack of cleavage, and white-to-stained appearance. Highly common in igneous and metamorphic terrains worldwide.

Identified on: 5/15/2026

Mode: Standard