sedimentary
Ferruginous Sandstone Pebble
Arenite with Iron Oxide matrix
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: Brownish-red to tan, Luster: Dull/Earthy, Texture: Clastic (fine-grained sand), Cleavage: None
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Brownish-red to tan, Luster: Dull/Earthy, Texture: Clastic (fine-grained sand), Cleavage: None
Formation & geological history
Formed by the accumulation and cementation of sand-sized grains, typically quartz, with iron oxides (hematite or limonite) acting as the binding agent. Common in Mesozoic or Cenozoic sedimentary basins. The rounded shape suggests fluvial (river) or glacial transport.
Uses & applications
Commonly used as construction aggregate or road base when found in large quantities; as a pebble, mainly a collector's curiosity.
Geological facts
The reddish color is due to the oxidation of iron, essentially 'rusting' within the rock layers. The Saratov region (51.5N, 45.9E) is characterized by extensive Cretaceous and Palaeogene sedimentary deposits where such sandstones are common.
Field identification & locations
Identify by its gritty sandpaper feel and its ability to scratch glass if quartz-heavy. In the Saratov/Volga region, these are ubiquitous in riverbeds and ravines.
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