sedimentary
Ferruginous Sandstone (with possible Epidote/Chlorite coloring)
Sandstone (SiO2 dominated with Fe2O3 staining)
Hardness: 6-7 (Mohs scale), Color: Tan to reddish-brown with green patches, 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: Tan to reddish-brown with green patches, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. The reddish hues suggest iron oxide (rust) staining, while the green highlights suggest low-grade metamorphism or hydrothermal alteration involving epidote or chlorite minerals.
Uses & applications
Common sandstone is used extensively in construction as building stone, road base, and in the manufacturing of glass or concrete (when crushed).
Geological facts
Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. It is a vital reservoir rock for groundwater, oil, and natural gas due to its high porosity and permeability.
Field identification & locations
Identify in the field by its 'sandpaper' texture and visible mineral grains. It often displays bedding planes. This specimen shows significant weathering. Common in arid environments or along ancient riverbeds and coastlines.
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