metamorphic
Iron-stained quartz-rich rock (likely ferruginous quartzite)
Quartz-rich silicate rock, probably ferruginous quartzite; exact identification requires testing
AI-generated identification · may be incorrectRough, rusty orange-brown specimen with scattered reflective grains. If quartz-dominated, hardness is about 7 Mohs, luster vitreous to dull, and cleavage absent; visible sparkle may be mica or quartz grains.
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Physical properties
Rough, rusty orange-brown specimen with scattered reflective grains. If quartz-dominated, hardness is about 7 Mohs, luster vitreous to dull, and cleavage absent; visible sparkle may be mica or quartz grains.
Formation & geological history
Quartz-rich sediment or sandstone can be cemented and recrystallized during metamorphism, while iron oxides impart the rusty color. Such rocks form across many geological ages and settings.
Uses & applications
Quartzite is used as building stone, aggregate, and landscaping material; attractive pieces may be collected or cut for decorative use.
Geological facts
Iron oxides such as hematite and goethite commonly create red, orange, and brown staining in quartz-rich rocks.
Field identification & locations
Look for a hard, gritty-to-glassy texture and grains that resist scratching by a steel knife; fizzing in dilute acid would instead suggest carbonate rock. Quartzite occurs worldwide in metamorphic belts.
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