metamorphic
Iron-stained quartzite (likely)
Quartz-rich quartzite, predominantly SiO₂, with iron-oxide staining
AI-generated identification · may be incorrectMassive, coarse-grained, mostly tan to cream with rusty red-brown patches; vitreous to dull luster. Quartz hardness is 7 Mohs; individual grains are interlocked, with no obvious cleavage. The image alone cannot confirm the identification or specific gravity.
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Physical properties
Massive, coarse-grained, mostly tan to cream with rusty red-brown patches; vitreous to dull luster. Quartz hardness is 7 Mohs; individual grains are interlocked, with no obvious cleavage. The image alone cannot confirm the identification or specific gravity.
Formation & geological history
Quartz-rich sandstone recrystallized under heat and pressure into quartzite; iron oxides can produce the colored patches. Such rocks form in many geologic eras, so age cannot be determined from the photograph.
Uses & applications
Quartzite is used as dimension stone, aggregate, and decorative landscaping stone; this rounded specimen is mainly suitable for collecting or display.
Geological facts
Quartzite is tougher than ordinary sandstone because recrystallized quartz grains are tightly intergrown.
Field identification & locations
The rounded, weathered shape and quartz-rich appearance fit a natural rock specimen, but a close inspection of grain boundaries or a hardness test would help distinguish quartzite from quartz-rich vein rock. Quartzite occurs worldwide, especially in mountain belts.
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