mineral

Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Milky white to translucent grey; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Hardness: 7 on Mohs scale
Color: Milky white to translucent grey
Luster: Vitreous to greasy

Identified April 8, 2026More mineral →

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Physical properties

Hardness: 7 on Mohs scale; Color: Milky white to translucent grey; 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 within crustal fractures and veins, often associated with orogenic belts and igneous intrusions. Can be found in rocks from virtually any geological age.

Uses & applications

Used as a source of silica for glassmaking, electronics (piezoelectric properties), abrasives, and as architectural stone or garden landscaping rock.

Geological facts

Quartz is the second most abundant mineral in Earth's continental crust. Pure quartz is colorless, but impurities and microscopic fluid inclusions create the 'milky' appearance seen in this specimen.

Field identification & locations

Identify in the field by its hardness (it will scratch glass and steel), lack of cleavage, and characteristic conchoidal fracture. Commonly found in riverbeds, mountains, and as protruding veins in host rock.