sedimentary
Sandstone (with banding)
Arenite (primarily SiO2)
Hardness: 6-7 (on Mohs scale); Color: Gray to tan with distinct banding; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 (on Mohs scale)
- Color
- Gray to tan with distinct banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (on Mohs scale); Color: Gray to tan with distinct banding; Luster: Dull/Earthy; Crystal Structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (sand) over millions of years. This specimen shows differential weathering or mineral staining (Liesegang rings) common in Paleozoic or Mesozoic formations.
Uses & applications
Used primarily in construction as a building stone or road base, as an abrasive agent, and occasionally for simple decorative lapidary work.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The distinct bands are often caused by the rhythmic precipitation of iron oxides from groundwater.
Field identification & locations
Identify by its gritty, sandpaper-like texture and the visible presence of small grains. It is commonly found in desert environments, river basins, and coastal areas.
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