metamorphic
Quartz-rich breccia or iron-stained quartzite
Silica-rich rock dominated by quartz (SiO₂), with minor iron oxides and possible feldspar
AI-generated identification · may be incorrectHardness about 6.5–7 Mohs; cream, tan, and reddish-brown coloration; vitreous to earthy luster; irregular granular texture with no obvious cleavage. The angular, pale fragments and iron staining suggest brecciation or weathering.
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Physical properties
Hardness about 6.5–7 Mohs; cream, tan, and reddish-brown coloration; vitreous to earthy luster; irregular granular texture with no obvious cleavage. The angular, pale fragments and iron staining suggest brecciation or weathering.
Formation & geological history
Likely formed from quartz-rich sediment or hydrothermal silica that was cemented and/or metamorphosed, then oxidized near the surface; precise age and locality cannot be determined from the photograph.
Uses & applications
Mostly a collector specimen or decorative stone; quartzite can be used as aggregate, paving, and building stone, though this irregular piece has little commercial value.
Geological facts
Quartz-rich rocks commonly resist weathering, leaving angular resistant fragments and ridges. The reddish coloration is typically caused by hematite or limonite coatings.
Field identification & locations
Look for glassy quartz grains, strong resistance to scratching, and inability to scratch quartz with a steel knife; acid testing is generally unhelpful. Common in metamorphic belts and quartz-vein zones worldwide.
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