mineral
Iron-stained quartz
Quartz (SiO₂), likely with iron-oxide staining and possible host-rock inclusions
AI-generated identification · may be incorrectMohs hardness 7; translucent to opaque, yellow-brown with a gray-brown interior and vitreous to dull luster. Quartz has a trigonal crystal structure and no cleavage, breaking with irregular or conchoidal fractures.
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Physical properties
Mohs hardness 7; translucent to opaque, yellow-brown with a gray-brown interior and vitreous to dull luster. Quartz has a trigonal crystal structure and no cleavage, breaking with irregular or conchoidal fractures.
Formation & geological history
Quartz commonly forms in hydrothermal veins and cavities as silica-rich fluids cool; iron oxides can stain it yellow or brown. Its age cannot be determined from the image and depends on the host geology.
Uses & applications
Quartz is used in glass, electronics, abrasives, and jewelry; this rough, included piece is mainly suitable for collecting or display.
Geological facts
The brown coloration is consistent with iron-oxide staining, but the photo alone cannot confirm the inclusions or exact variety.
Field identification & locations
Look for glassy areas, irregular fracture, and hardness sufficient to scratch ordinary glass; avoid relying on color alone to identify it. Quartz occurs worldwide in veins and many rock types.
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