Milky Quartz with Iron Staining and Matrix

Physical Properties

Hardness: 7 on Mohs scale; Color: Opaque white with orange/red iron staining and grey lithic matrix; Luster: Vitreous to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None/Conchoidal fracture; Specific gravity: 2.65.

Formation & Geological History

Formed from silica-rich hydrothermal fluids cooling in veins or cavities within the earth's crust. It can form in various temperatures and pressures across most geological eras.

Uses & Applications

Used in glass manufacturing, electronics (due to piezoelectric properties), construction aggregates, and widely collected as mineral specimens or decorative stones.

Geological Facts

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

Field Identification & Locations

Identify by its hardness (it will easily scratch glass) and lack of cleavage (it breaks in irregular, curved 'conchoidal' patterns). Common in mountainous regions and riverbeds.

Identified on: 4/17/2026

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