Quartz (Vein Quartz)

Physical Properties

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

Formation & Geological History

Formed from silica-rich hydrothermal fluids precipitating in rock fractures (veins) or as a major constituent of igneous and metamorphic rocks. This specimen likely originated as a hydrothermal vein deposit.

Uses & Applications

Used in the manufacturing of glass, abrasives, electronics (as piezoelectric crystals), and as a gemstone or decorative aggregate in construction.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its name comes from the German word 'Quarz', which means 'hard'. It is highly resistant to both chemical and physical weathering.

Field Identification & Locations

Identify in the field by its hardness (it can scratch glass and steel), lack of cleavage, and waxy/vitreous appearance. Commonly found in riverbeds, mountains, and desert pavements globally.

Identified on: 5/13/2026

Mode: Standard