mineral
Quartz (Iron-stained Quartz)
Silicon Dioxide (SiO2)
Hardness 7 on Mohs scale, milky white to yellowish-orange hue due to iron oxide staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, no cleavage.
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Physical properties
Hardness 7 on Mohs scale, milky white to yellowish-orange hue due to iron oxide staining, vitreous to greasy luster, trigonal crystal system, conchoidal fracture, no cleavage.
Formation & geological history
Formed in igneous, metamorphic, and sedimentary environments through hydrothermal fluids filling veins and cavities. Very common worldwide.
Uses & applications
Used widely in glassmaking, electronics (piezoelectric properties), abrasives, gemstone jewelry, and decorative stone collections.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. Iron oxide coatings often give clear or milky quartz a warm orange or reddish coat.
Field identification & locations
Identified by its ability to scratch glass (hardness 7), lack of cleavage, and characteristic conchoidal fracture. Found virtually anywhere in granite terrains and gravel beds.
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Sandstone with Mineral Veining or Crust
Sedimentary Sandstone (mostly SiO2 with Fe2O3 tinting)
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