sedimentary
Iron-stained sandstone pebble
Ferruginous sandstone, composed mainly of quartz grains cemented by iron oxides
AI-generated identification · may be incorrectThe specimen appears tan to rusty orange with a dull, rough, granular surface. Likely Mohs hardness 6–7 for quartz grains; crystal structure is not visible, and the rock has no consistent cleavage. Exact composition and properties cannot be confirmed from the photo alone.
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Physical properties
The specimen appears tan to rusty orange with a dull, rough, granular surface. Likely Mohs hardness 6–7 for quartz grains; crystal structure is not visible, and the rock has no consistent cleavage. Exact composition and properties cannot be confirmed from the photo alone.
Formation & geological history
Sandstone forms when deposited sand is compacted and cemented; iron oxides impart the rusty color. Its age and specific depositional environment cannot be determined from the image.
Uses & applications
Commonly used as building or landscaping stone and as a source of aggregate; this small piece is mainly suitable for collecting or decoration.
Geological facts
Iron oxides such as hematite or goethite commonly stain sandstone red, orange, or brown.
Field identification & locations
Look for a gritty texture and visible sand-sized grains; a fresh surface may reveal cement or layering. Sandstone is widespread in sedimentary basins worldwide.
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