Quartz (Iron-stained)

Physical Properties

Hardness: 7 (Mohs scale), Color: tan to creamy white with orange/red iron staining, Luster: Vitreous to waxy, Crystal structure: Trigonal/Hexagonal, Cleavage: Indistinct/Conchoidal fracture, Specific gravity: 2.65

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within igneous and metamorphic rocks. This specific specimen appears to be a water-worn or tumbled fragment likely originating from a vein.

Uses & Applications

Common quartz has massive industrial applications in glassmaking, abrasives, and electronics. Tumbled specimens are used for hobbyist collecting, 'worry stones', and aquarium decor.

Geological Facts

Quartz is the most abundant and stable mineral on Earth's continental crust. The tan/orange hue is caused by trace amounts of iron oxides (hematite or limonite) coating or permeating the surface.

Field Identification & Locations

Identify in the field by its hardness (it will easily scratch glass) and lack of cleavage (it breaks in irregular, shell-like curves). It is found worldwide in riverbeds, mountains, and deserts.

Identified on: 4/17/2026

Mode: Standard