sedimentary
Ferruginous Sandstone Pebble
Iron-rich Clastic Sedimentary Rock
Hardness: 6-7 (Mohs scale); Color: Dark brown to reddish-brown; Luster: Dull to earthy; Texture: Fine-grained, gritty feel; Shape: Water-worn/rounded.
- Hardness
- 6-7 (Mohs scale)
- Color
- Dark brown to reddish-brown
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Dark brown to reddish-brown; Luster: Dull to earthy; Texture: Fine-grained, gritty feel; Shape: Water-worn/rounded.
Formation & geological history
Formed through the lithification of sand grains bound by iron-oxide cement (such as hematite or goethite). These stones are common in coastal and river environments where water action rounds the fragments over centuries.
Uses & applications
Commonly used for landscaping, road base, and construction aggregate when crushed. Small rounded pebbles are popular for decorative garden paths or aquarium substrate.
Geological facts
The reddish-brown streak visible on the stone is often caused by the oxidation of iron minerals within the rock, essentially a form of natural 'rusting' that cements the sand grains together.
Field identification & locations
Look for a gritty texture and a heavy feel relative to size due to iron content. Found commonly on beaches and in stream beds. Collectors often look for examples with unique weathering patterns.
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