metamorphic
Iron-stained quartzite
Quartzite, composed predominantly of quartz (SiO₂), with iron-oxide staining
AI-generated identification · may be incorrectThe fragments show a rusty golden-brown surface and pale gray-white edges, with a dull to slightly vitreous luster. Quartz has Mohs hardness 7; quartzite is dense and typically lacks cleavage, breaking irregularly.
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Physical properties
The fragments show a rusty golden-brown surface and pale gray-white edges, with a dull to slightly vitreous luster. Quartz has Mohs hardness 7; quartzite is dense and typically lacks cleavage, breaking irregularly.
Formation & geological history
Formed when quartz-rich sandstone was recrystallized under heat and pressure; iron oxides can produce the orange-brown coloration. Its age cannot be determined from the image.
Uses & applications
Quartzite is used as building and paving stone, road aggregate, and decorative stone; these small fragments are mainly suitable for collecting.
Geological facts
Quartzite’s interlocking quartz grains make it generally harder and more resistant to weathering than its sandstone precursor.
Field identification & locations
Look for a hard, quartz-rich rock whose grains often fracture through rather than around individual grains; rusty coatings may indicate iron oxides. Quartzite is widespread in metamorphic terrains worldwide.
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