mineral
Quartz (Iron-Stained)
Silicon Dioxide (SiO2)
Hardness of 7 on the Mohs scale, vitreous to greasy luster, translucent to transparent, conchoidal fracture, hexagonal crystal system, specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, translucent to transparent, conchoidal fracture, hexagonal crystal system, specific gravity of 2.65.
Formation & geological history
Formed in hydrothermal veins, pegmatites, and sedimentary environments. The reddish-brown band is caused by iron oxide (limonite or hematite) staining.
Uses & applications
Used in electronics, optics, manufacturing of glass and ceramics, gemstone carvings, and as a popular mineral for rock and crystal collectors.
Geological facts
Quartz is one of the most abundant minerals in Earth's continental crust. It exhibits piezoelectric properties, meaning it can generate an electric charge under mechanical stress.
Field identification & locations
Easily identified by its hardness (scratches glass), lack of cleavage, and glassy appearance. Found globally in almost all geological environments.
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Limonite / Goethite (Iron Ore Mineral nodule)
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Schist
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