metamorphic
Iron-rich quartzite or weathered ironstone
Quartzite dominated by quartz (SiO₂), with iron oxides such as hematite/goethite
AI-generated identification · may be incorrectBrown-orange, earthy to slightly glassy luster, irregular granular texture, and no visible cleavage; quartz hardness is about 7 Mohs, while its specific gravity is commonly 2.6–2.8. The rusty coloration indicates iron-oxide staining or cement.
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Physical properties
Brown-orange, earthy to slightly glassy luster, irregular granular texture, and no visible cleavage; quartz hardness is about 7 Mohs, while its specific gravity is commonly 2.6–2.8. The rusty coloration indicates iron-oxide staining or cement.
Formation & geological history
Likely formed from quartz-rich sandstone recrystallized during metamorphism, then weathered and oxidized near the surface; its exact geological age cannot be determined from the image. Similar material occurs in many ancient metamorphic terrains.
Uses & applications
Used as aggregate, building stone, landscaping rock, and occasionally as a cabochon or display specimen when attractive. This small piece has little commercial value.
Geological facts
Quartzite typically breaks across grains rather than along bedding, producing a hard, durable fragment; iron oxides can create red, orange, or brown patches.
Field identification & locations
Field tests include scratching glass, observing a mostly quartz-like granular fracture, and checking that dilute acid produces no fizz. Common in metamorphic belts and gravel deposits; the image is insufficient for a precise identification.
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