mineral

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Hardness: 7 on Mohs scale; Color: Clear to white with orange/brown iron staining; Luster: Vitreous (glassy) to greasy; Crystal Structure: Trigonal/Hexagonal; Cleavage: None (conchoidal fracture); Specific Gravity: 2.65

Hardness: 7 on Mohs scale
Color: Clear to white with orange/brown iron staining
Luster: Vitreous (glassy) to greasy

Identified July 3, 2026More mineral →

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Physical properties

Formation & geological history

Formed from silica-rich hydrothermal fluids cooling in veins, or as a primary mineral in igneous rocks like granite. This specific piece shows surface staining from iron oxides (limonite/hematite) typical of secondary weathering.

Uses & applications

Raw quartz is used in shoreline stabilization, road base, and as a source for silicon in semiconductors. Iron-stained pieces are mostly of interest to hobbyist collectors.

Geological facts

Quartz is one of the most abundant minerals in Earth's crust. The orange-brown 'rust' on this specimen is actually a thin coating of iron oxide that has permeated cracks and surfaces.

Field identification & locations

Identify by its ability to scratch glass and its lack of cleavage. Look for the distinct glassy fracture. This is a very common find in gravel pits, riverbeds, and as vein material in many mountain ranges worldwide.