sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
Hardness: 6-7 (individual quartz grains), Color: Tan to reddish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (individual quartz grains), Color: Tan to reddish-brown, 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 or rock fragments. The brownish tint suggests the presence of iron oxides like hematite or limonite. Found in various geological ages globally.
Uses & applications
Commonly used in construction, paving, and as a decorative stone. High-quality sandstone is used for gritstone in grinding.
Geological facts
Sandstone is one of the most common sedimentary rocks on Earth and makes up about 20% of all sedimentary rocks in the crust.
Field identification & locations
Identify by its gritty, sand-like texture and visible grains. Often found in riverbeds, deserts, or coastal areas. This small specimen is a common field find.
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