Quartz (Milky Quartz)

Physical Properties

Hardness: 7 on the Mohs scale. Color: White to off-white/yellowish due to iron staining. Luster: Vitreous to greasy. Crystal structure: Trigonal/Hexagonal. Cleavage: None (conchoidal fracture). Specific gravity: 2.65.

Formation & Geological History

Formed through the cooling of silica-rich magma or from hydrothermal veins. It can be found in almost all geological environments and across all geological ages, from Precambrian to recent times.

Uses & Applications

Used in glassmaking, abrasives, and as a gemstone. In industry, it is essential for electronics (piezoelectric properties) and as an aggregate in construction/concrete.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Milky quartz gets its cloudy appearance from tiny fluid inclusions of gas or liquid trapped during crystal growth.

Field Identification & Locations

Identify in the field by its hardness (it can scratch glass and steel), lack of cleavage, and waxy/white appearance. Common in riverbeds, mountains, and as garden stones globally.

Identified on: 4/17/2026

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