Quartz (Milky Quartz)

Physical Properties

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

Formation & Geological History

Forms in a wide variety of environments, most commonly from hydrothermal veins or cooling igneous magma. This specimen appears water-worn or weathered, likely found in a riverbed or secondary deposit.

Uses & Applications

Used in glassmaking, abrasives, electronics (piezoelectric properties), and as decorative gravel or gemstones.

Geological Facts

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

Field Identification & Locations

Identify by its hardness (it will easily scratch glass) and lack of cleavage planes. Found globally in almost all geological environments.

Identified on: 4/14/2026

Mode: Standard