Quartz (Iron-stained)

Physical Properties

Hardness: 7 (Mohs scale), Color: Yellow-orange to brown surface with translucent white interior, Luster: Vitreous to greasy, Crystal Structure: Trigonal/Hexagonal, Cleavage: None (conchoidal fracture), Specific Gravity: 2.65

Formation & Geological History

Formed through hydrothermal processes in igneous veins or as a secondary mineral in sedimentary environments. Its rounded shape suggests it has been tumbled in water (river or beach) over thousands to millions of years.

Uses & Applications

Common quartz is used for abrasive sand, glassmaking, and in electronics for its piezoelectric properties. This specific specimen is mostly of interest to hobbyist collectors.

Geological Facts

The yellow-brown color on the surface is not the color of the quartz itself, but iron oxide (rust) coating or staining small fractures within the stone. Quartz is the second most abundant mineral in Earth's continental crust.

Field Identification & Locations

Identify by its ability to scratch glass and lack of cleavage. This rounded 'river rock' form is common in fluvial deposits globally. Collectors look for clarity or unique inclusions.

Identified on: 4/25/2026

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