metamorphic
Iron-stained quartz-rich rock, likely quartzite
Quartzite, predominantly quartz (SiO₂), with iron-oxide staining
AI-generated identification · may be incorrectRough, angular specimen with gray-white and rusty brown surfaces. Quartz has Mohs hardness 7, vitreous luster, and no cleavage; the photo does not show enough detail to confirm texture or composition.
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Physical properties
Rough, angular specimen with gray-white and rusty brown surfaces. Quartz has Mohs hardness 7, vitreous luster, and no cleavage; the photo does not show enough detail to confirm texture or composition.
Formation & geological history
Quartzite forms when quartz-rich sandstone is recrystallized by heat and pressure during metamorphism; iron oxides can stain it during weathering. Its age and specific formation setting cannot be determined from the image.
Uses & applications
Quartzite is used as building and paving stone, crushed aggregate, and sometimes decorative stone; this small rough piece is mainly suitable for collecting.
Geological facts
Rust-colored areas commonly reflect iron oxides such as hematite or goethite rather than metallic iron.
Field identification & locations
A likely quartzite identification is suggested by the hard, quartz-rich appearance and rusty weathering, but a fresh break or hardness test would help distinguish it from iron-stained quartz vein rock. Quartzite occurs worldwide in metamorphic terrains.
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