Quartz Vein (Iron-stained)

Physical Properties

Hardness: 7 (Mohs scale); Color: White to translucent with yellow-orange iron staining; Luster: Vitreous to greasy; Crystal structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes where silica-rich fluids were injected into cracks of host rocks. The iron staining occurs post-formation through the oxidation of associated minerals like pyrite or from mineral-rich groundwater.

Uses & Applications

Common quartz is used for abrasive powders, glass making, and as a source of silicon for electronics. Iron-stained specimens are primarily of interest to amateur collectors.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. The yellow-orange 'rust' visible on this specimen is likely Limonite, which is often found coating quartz that has been exposed to weathering.

Field Identification & Locations

Identify in the field by its ability to scratch glass and lack of cleavage. Look for it in quartz veins cutting through igneous or metamorphic host rocks. It is a common indicator mineral for other deposits including gold.

Identified on: 4/18/2026

Mode: Standard