sedimentary
Sandstone with Iron Concretion
Quartz arenite with limonite-hematite concretion
AI-generated identification · may be incorrectHardness of 6-7 on the Mohs scale due to quartz grains. Displays brownish-red and grey banded coloration with a dull to earthy luster.
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Physical properties
Hardness of 6-7 on the Mohs scale due to quartz grains. Displays brownish-red and grey banded coloration with a dull to earthy luster.
Formation & geological history
Formed through the cementation of quartz sand grains in ancient marine or terrestrial environments, subsequently altered by iron-rich groundwater precipitating oxides.
Uses & applications
Used primarily in landscaping, decorative stone, and as a geological specimen for collectors.
Geological facts
The distinctive curved ridges are weathering-resistant ironstone ledges that formed within the softer sandstone matrix.
Field identification & locations
Identify by its gritty texture combined with hard, protruding iron-stained ridges. Found globally in sedimentary basins.
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