sedimentary
Sandstone (with Iron Oxidation)
Arenite (SiO2 with Fe-oxides)
Hardness: 6-7 (Mohs scale), Color: tan, white, brown with rusty orange/red banding, Luster: dull to earthy, Crystal Structure: clastic (granular), Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, white, brown with rusty orange/red banding, Luster: dull to earthy, Crystal Structure: clastic (granular), Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically within river, desert, or marine environments. The visible banding suggests distinct depositional events or mineral leaching over geological time.
Uses & applications
Commonly used as a building material in masonry, paving slabs, and as an abrasive in tool sharpening. It is also an important reservoir rock for groundwater and petroleum.
Geological facts
Sandstone constitutes about 20-25% of all sedimentary rocks on Earth. The red/orange bands are caused by the presence of hematite or limonite (iron oxides) acting as a natural cement.
Field identification & locations
Identify by its 'sandpaper' texture and visible layering (stratification). Look for it in canyons, riverbeds, and cliffs. It will often feel gritty to the touch and can be easily scratched by a steel nail if the cement is weak.
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Arenite (if sandstone)
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Cone-in-cone structure (Secondary Sedimentary Structure)
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Chert Breccia
Brecciated Chert (Microcrystalline Silica)
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Sandstone Grain
Clastic Sedimentary Rock Grain (SiO2 dominated)
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Shale or Slaty Mudstone
Argillaceous sedimentary rock
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Sandstone
Arenite (primarily SiO2)
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