mineral
Quartz with Iron Oxide Inclusions
Silicon dioxide with limonite/hematite (SiO2)
AI-generated identification · may be incorrectHardness of 7 on the Mohs scale, vitreous to greasy luster, transparent to translucent white/clear areas with dark brown or black iron oxide staining, conchoidal fracture, hexagonal crystal system (though amorphous or microcrystalline in this habit), specific gravity of 2.65.
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Physical properties
Hardness of 7 on the Mohs scale, vitreous to greasy luster, transparent to translucent white/clear areas with dark brown or black iron oxide staining, conchoidal fracture, hexagonal crystal system (though amorphous or microcrystalline in this habit), specific gravity of 2.65.
Formation & geological history
Formed via hydrothermal veins where silica-rich fluids crystallized under pressure and temperature, often subjected to weathering and groundwater movement that deposited iron and manganese oxides into fractures over millions of years.
Uses & applications
Used in lapidary arts, wire-wrapping jewelry, mineral collecting, and metaphysical applications.
Geological facts
Quartz is the second most abundant mineral in Earth's continental crust. The dark bands and stains are typically caused by secondary iron minerals like goethite or hematite infiltrating micro-fractures within the quartz matrix.
Field identification & locations
Easily identified by its high hardness (scratches glass) and conchoidal fracture. Common worldwide in pegmatites, hydrothermal veins, and metamorphic rocks.
