mineral
Iron-stained quartz fragment
Quartz (SiO₂), likely colored by iron-oxide staining
AI-generated identification · may be incorrectSmall, yellow-orange, translucent to opaque fragment with a vitreous luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, but the photo alone cannot confirm the identification.
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Physical properties
Small, yellow-orange, translucent to opaque fragment with a vitreous luster and irregular fracture; quartz has Mohs hardness 7 and a trigonal crystal structure, but the photo alone cannot confirm the identification.
Formation & geological history
Quartz commonly forms in silica-rich veins and cavities as mineral-bearing fluids cool; iron oxides can stain its surface. Its age cannot be determined from the image.
Uses & applications
This small rough piece has little commercial value; larger, clearer quartz is used in jewelry, glassmaking, electronics, and industry.
Geological facts
Quartz is one of Earth’s most abundant minerals and has no true cleavage, typically breaking with a curved or uneven fracture.
Field identification & locations
Look for glassy luster, hardness sufficient to scratch ordinary glass, and no cleavage; quartz occurs worldwide in veins, pegmatites, and many rocks. Similar-looking yellow minerals may require testing to distinguish.
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