sedimentary
Sandstone (with Iron Staining)
Clastic Sedimentary Rock (primarily Quartz with Fe2O3 staining)
Hardness 6-7 (Mohs), tan to reddish-brown color, dull/earthy luster, granular texture, no cleavage, specific gravity 2.2-2.8
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Physical properties
Hardness 6-7 (Mohs), tan to reddish-brown color, dull/earthy luster, granular texture, no cleavage, specific gravity 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in desert, river, or coastal environments during various geological eras.
Uses & applications
Commonly used as a building material, for paving, in the manufacture of glass (if high quartz purity), and as an aquifer for groundwater and petroleum.
Geological facts
Sandstone represents about 20% of all sedimentary rocks on Earth. The red hues are typically due to iron oxide (hematite) coating the sand grains.
Field identification & locations
Identified by its 'sandpaper' feel and visible grains. Often found in layered formations or canyon walls. Collectors look for unique banding patterns (Wonderstone) or fossils.
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