sedimentary
Sandstone (with concrete/human-made layer)
Clastic Sedimentary Rock (primarily Quartz/Feldspar grains)
Hardness: 6-7 (Mohs scale), Color: Reddish-pink and grey, Luster: Dull/Earthy, Crystal structure: Granular/Clastic, Cleavage: None/Conchoidal fractures, Specific gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Reddish-pink and grey, Luster: Dull/Earthy, Crystal structure: Granular/Clastic, Cleavage: None/Conchoidal fractures, Specific gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments of sand size over millions of years. This specific piece appears to have an upper sedimentary layer and a lower conglomerate or man-made mixture (mortar/concrete) attached.
Uses & applications
Used widely as architectural stone, road base, abrasive material for grinding, and as a reservoir rock for oil and water.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. The reddish hue usually indicates the presence of iron oxides like hematite or goethite.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible grains. Often found in desert environments, river basins, and ocean coastlines. This specimen looks like a fragment of building material or a paver.
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