sedimentary
Ferruginous Siltstone
Siltstone with Magnetite/Hematite bands
Hardness: 5-7 (Mohs); Color: Reddish-brown with dark grey/black bands; Luster: Dull to earthy; Texture: Fine-grained, smooth from water-tumbling; Structure: Clastic with distinct bedding planes.
- Hardness
- 5-7 (Mohs)
- Color
- Reddish-brown with dark grey/black bands
- Luster
- Dull to earthy
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Physical properties
Hardness: 5-7 (Mohs); Color: Reddish-brown with dark grey/black bands; Luster: Dull to earthy; Texture: Fine-grained, smooth from water-tumbling; Structure: Clastic with distinct bedding planes.
Formation & geological history
Formed through the lithification of silt-sized particles deposited in riverbeds or marine environments. The dark bands represent iron-rich mineral layers (magnetite or hematite). Dating ranges widely, often Paleozoic or Mesozoic in Central European river deposits.
Uses & applications
A common river stone used primarily for decorative landscaping, gravel, or as a collector's specimen for studying sedimentary layering and iron deposition.
Geological facts
In the region of Slovenia and Austria (near 46.5°N, 15.6°E), such stones are common in Alpine river runoff. The reddish color is due to the oxidation of iron, essentially 'natural rust' within the rock matrix.
Field identification & locations
Identify by its weight (slightly heavier than average due to iron) and the parallel banding. These are frequently found in the Drava or Mur river basins. For collectors, look for specimens with clear, straight mineral veins or unique cross-bedding.
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