sedimentary
Sandstone (Red/Brown Pebble)
Arenite / Quartzarenite (SiO2 with iron oxides)
Hardness: 6-7 (depends on cementation), Color: reddish-brown to dark chocolate brown, Luster: dull to earthy, Texture: fine to medium sand grain size, felted or rough abrasive feel, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (depends on cementation), Color: reddish-brown to dark chocolate brown, Luster: dull to earthy, Texture: fine to medium sand grain size, felted or rough abrasive feel, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation, compaction, and cementation of mineral or rock particles (primarily quartz and feldspar) in desert, river, or ocean environments, rich in hematite/iron oxide cement.
Uses & applications
Commonly used as building stone, paving, gravel, landscaping, and in construction. Small pebbles hold landscape value or educational value.
Geological facts
Red and brown sandstone gets its color from iron oxide coatings (hematite) on individual quartz grains, similar to the rocks found in the American Southwest and Australian Outback.
Field identification & locations
Identified by its gritty, sandpaper-like texture and distinct grainy surface. Extremely common along riverbeds, beaches, and eroded cliff faces globally.
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