Quartz (Iron-Stained)

Physical Properties

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

Formation & Geological History

Formed from silica-rich hydrothermal fluids or within igneous pegmatites. The reddish tint comes from later exposure to iron oxide (hematite or limonite) through groundwater seepage into fractures.

Uses & Applications

Primary source of silicon for electronic chips, glass manufacturing, abrasives, and as a semi-precious gemstone in jewelry or for metaphysical collection.

Geological Facts

Quartz is the second most abundant mineral in Earth's continental crust. Its piezoelectric properties mean it can generate an electric charge under mechanical stress, which is why it is used in watches.

Field Identification & Locations

Identify in the field by its ability to scratch glass and its lack of cleavage. It is commonly found in gravel pits, riverbeds, and as veins in mountains. This specific piece shows common 'rusty' weathering.

Identified on: 4/15/2026

Mode: Standard