sedimentary
Red sandstone pebble
Quartz-rich sandstone, likely ferruginous arkose or litharenite
AI-generated identification · may be incorrectHardness about 6–7 for quartz grains; reddish-brown, dull to slightly earthy luster, fine-grained and rounded. The color comes from iron-oxide coatings or cement; no obvious cleavage or visible crystals.
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Physical properties
Hardness about 6–7 for quartz grains; reddish-brown, dull to slightly earthy luster, fine-grained and rounded. The color comes from iron-oxide coatings or cement; no obvious cleavage or visible crystals.
Formation & geological history
Formed when sand accumulated, was compacted, and cemented by silica and iron oxides, commonly in rivers, deserts, or floodplains. Its exact geological age cannot be determined from the image; the rounded shape indicates later stream or beach transport.
Uses & applications
Used locally as aggregate, landscaping stone, and decorative material; this ordinary pebble has little jewelry or industrial value.
Geological facts
Sandstone is classified by grain size and composition, and iron oxidation commonly produces red and orange hues. Surface rounding reflects abrasion during transport.
Field identification & locations
Identify it by visible granular texture, earthy red color, lack of glassy conchoidal fracture, and possible grit under magnification; common worldwide in sandstone terrains and riverbeds.
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