mineral
Iron-stained quartz
Quartz (SiO₂), colored by iron-oxide/hydroxide staining
AI-generated identification · may be incorrectHardness 7 Mohs; translucent to opaque orange, honey-yellow, and white; vitreous to slightly dull luster; crystalline quartz, with no cleavage and irregular fracture. The rusty color likely comes from surface or internal iron staining.
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Physical properties
Hardness 7 Mohs; translucent to opaque orange, honey-yellow, and white; vitreous to slightly dull luster; crystalline quartz, with no cleavage and irregular fracture. The rusty color likely comes from surface or internal iron staining.
Formation & geological history
Quartz commonly forms in hydrothermal veins and silica-rich rocks; iron staining develops when iron-bearing fluids or weathering products coat or penetrate it. The specimen’s age and precise geological setting cannot be determined from the image.
Uses & applications
Quartz is used in glass, abrasives, electronics, and construction; attractive iron-stained pieces are mainly collected or used decoratively.
Geological facts
Iron oxides such as hematite and goethite can color otherwise colorless quartz orange, red, or brown.
Field identification & locations
Look for glassy sparkle, hardness sufficient to scratch ordinary glass, and lack of cleavage; the orange color alone is not diagnostic. Quartz occurs worldwide in veins, pegmatites, and many sedimentary and metamorphic rocks.
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