sedimentary
Sandstone (with Iron Siderite Concretion)
Arenite with Ironstone Concretion (FeCO3)
Hardness: 6-7 (for the quartz grains); Color: Gray-brown to tan; Luster: Dull/Earthy; Structure: Clastic, granular texture with concentric layering; Specific Gravity: 2.3-2.6.
- Hardness
- 6-7 (for the quartz grains)
- Color
- Gray-brown to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (for the quartz grains); Color: Gray-brown to tan; Luster: Dull/Earthy; Structure: Clastic, granular texture with concentric layering; Specific Gravity: 2.3-2.6.
Formation & geological history
Formed by the precipitation of mineral cement (like iron oxide or calcite) within the spaces between sediment grains, often around a nucleus. Highly common in Paleozoic to Cenozoic rock beds.
Uses & applications
Used primarily as decorative garden stones or geological teaching specimens. Larger sandstone deposits are used in construction and glassmaking.
Geological facts
These are often mistaken for fossilized eggs or meteorites due to their rounded, symmetrical shapes and layered internal structures.
Field identification & locations
Identify in the field by looking for rounded edges that differ from the surrounding bedding, often harder than the host rock. Found globally in riverbeds and eroded cliffs.
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