sedimentary
Red Sandstone Pebble
Arenite (Iron-oxide stained)
Hardness: 6.5-7 (Mohs scale), Color: reddish-brown to terracotta, Luster: dull to earthy, Texture: fine to medium-grained (clastic), Cleavage: absent.
- Hardness
- 6
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Physical properties
Hardness: 6.5-7 (Mohs scale), Color: reddish-brown to terracotta, Luster: dull to earthy, Texture: fine to medium-grained (clastic), Cleavage: absent.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments, typically in river beds, deserts, or marine environments. The reddish hue is caused by the presence of iron oxide (hematite) during the lithification process.
Uses & applications
Commonly used in landscaping, as decorative gravel, and historically as building material (Brownstone). Smooth pebbles like this are often used in aquariums, terrariums, or as pocket stones.
Geological facts
Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. The color of red sandstone is a reliable indicator that the rock formed in an oxidizing environment where iron-bearing minerals could rust.
Field identification & locations
Identify by its gritty texture (feels like sandpaper when rubbed) and visible sand grains. These water-worn pebbles are abundant in riverbeds, glacial deposits, and along coastlines near sandstone cliffs.
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