sedimentary
Limestone (River Pebble)
Calcium Carbonate (CaCO3)
Hardness: 3 (Mohs scale); Color: light gray to whitish; Luster: matte/earthy; Grain: fine-grained; Reaction: fizzes with dilute hydrochloric acid.
- Hardness
- 3 (Mohs scale)
- Color
- light gray to whitish
- Luster
- matte/earthy
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Physical properties
Hardness: 3 (Mohs scale); Color: light gray to whitish; Luster: matte/earthy; Grain: fine-grained; Reaction: fizzes with dilute hydrochloric acid.
Formation & geological history
Formed through the accumulation of shell, coral, algal, and fecal debris in marine environments. This specific specimen is a water-worn river pebble, likely transported by glacial or fluvial action from the Northern Limestone Alps.
Uses & applications
Used primarily in construction (crushed stone, cement), agriculture (lime), and as a basic landscaping material.
Geological facts
The coordinates provided (47.8°N, 9.6°E) are in Southern Germany, near Ravensburg. This region is dominated by Molasse deposits and Alpine glacial drift, where limestone pebbles are extremely common river and field finds.
Field identification & locations
Identify by its relative softness compared to quartz (cannot scratch glass) and its rounded shape from water erosion. Common in riverbeds and gravel pits throughout the Alpine foreland.
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