sedimentary
Sandstone (with Concretion)
Arenite / Quartzose Sandstone
Hardness: 6-7 (Mohs scale for quartz grains); Color: Tan, brown, buff; Luster: Dull or earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.3-2.4
- Hardness
- 6-7 (Mohs scale for quartz grains)
- Color
- Tan, brown, buff
- Luster
- Dull or earthy
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Physical properties
Hardness: 6-7 (Mohs scale for quartz grains); Color: Tan, brown, buff; Luster: Dull or earthy; Structure: Clastic, granular; Cleavage: None; Specific Gravity: 2.3-2.4
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (silt and sand). The rounded feature is a concretion formed by the precipitation of mineral cement in the spaces between particles.
Uses & applications
Used primarily as a construction material (dimension stone), in glass manufacturing (if high silica), and as a reservoir rock for oil, gas, and water.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. Concretions found within them are often mistaken for fossils or meteorites due to their unusual shapes.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. Concretions will appear as harder, distinct masses within the softer surrounding layers.
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