sedimentary
Sandstone with Iron Staining
Arenite (SiO2 with Fe2O3)
Hardness: 6-7 (Mohs scale), Color: Grey with reddish-brown/orange staining, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Grey with reddish-brown/orange staining, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments over millions of years. The red/orange tint indicates oxidation of iron-bearing minerals (limonite/hematite) within the porous matrix.
Uses & applications
Used primarily as a construction material, for paving, and as an architectural stone. Common specimens like this are primarily of educational or decorative interest.
Geological facts
Sandstone records the history of ancient environments like deserts, rivers, and beaches. The iron oxidation on its surface is effectively 'geological rust' that can permeate the entire rock layer.
Field identification & locations
Identified in the field by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in sedimentary basins. Collectors often look for unique erosion patterns or vivid coloration.
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