metamorphic
Iron-rich quartzite or ironstone fragment
Quartzite dominated by quartz (SiO₂), with iron oxides such as hematite/goethite
AI-generated identification · may be incorrectHardness about 6.5–7; rusty orange-brown, granular, and earthy to slightly glassy; massive texture with no obvious cleavage. The coloration likely comes from iron-oxide staining, and its density is commonly about 2.6–3.5 g/cm³.
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Physical properties
Hardness about 6.5–7; rusty orange-brown, granular, and earthy to slightly glassy; massive texture with no obvious cleavage. The coloration likely comes from iron-oxide staining, and its density is commonly about 2.6–3.5 g/cm³.
Formation & geological history
Likely formed when quartz-rich sandstone was metamorphosed and later stained or cemented by oxidized iron-bearing fluids. The image alone cannot establish its geological age; such rocks occur in many Precambrian and younger terrains.
Uses & applications
Ordinary pieces have little industrial value, though quartzite is used as aggregate, building stone, and decorative rock; attractive iron-stained pieces may be collected.
Geological facts
Quartzite is notably resistant to weathering, while hematite and goethite produce the red, orange, and yellow-brown colors typical of ironstone.
Field identification & locations
Look for a very hard, sparkly granular surface that scratches glass and does not fizz with dilute hydrochloric acid; a streak test may be reddish-brown. Common in metamorphic mountain belts and iron-rich sedimentary formations worldwide.
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