sedimentary
Sandstone (with Limonite staining)
Arenite (primarily SiO2 with FeO(OH)·nH2O)
Hardness: 6-7 (Mohs scale for grains); Color: Yellowish-brown to tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Feel: Gritty like sandpaper.
- Hardness
- 6-7 (Mohs scale for grains)
- Color
- Yellowish-brown to tan
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale for grains); Color: Yellowish-brown to tan; Luster: Dull/Earthy; Structure: Granular/Clastic; Cleavage: None; Feel: Gritty like sandpaper.
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The yellowish color indicates the presence of iron oxide minerals like limonite, typically formed in oxygen-rich terrestrial or shallow marine environments.
Uses & applications
Used primarily in construction as a building material, for paving, and as an abrasive. In smaller specimens, it is used for educational purposes and geological study.
Geological facts
Sandstone contains a record of the earth's history, often preserving ripple marks, cross-bedding, and occasionally fossils that indicate the direction of ancient water currents.
Field identification & locations
Identify in the field by its distinctive 'sandpaper' texture when rubbed. It is found globally in sedimentary basins, desert dunes, and ancient riverbeds.
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