sedimentary
Sandstone (Gneissic or Banded)
Clastic Sedimentary Rock (composed predominantly of SiO2)
Hardness: 6-7 on Mohs scale; Color: Gray, tan, and dark streaks; Luster: Dull/Earthy; Structure: Fine-grained with visible layering/bedding; Specific Gravity: 2.2–2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Gray, tan, and dark streaks
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Gray, tan, and dark streaks; Luster: Dull/Earthy; Structure: Fine-grained with visible layering/bedding; Specific Gravity: 2.2–2.8
Formation & geological history
Formed by the accumulation and lithification of mineral particles or rock fragments. The visible bands represent different layers of sediment deposited over time in a marine or river environment.
Uses & applications
Used primarily in construction, decorative landscaping, and as a common find for collectors of river-worn stones.
Geological facts
Sandstone accounts for approximately 20-25% of all sedimentary rocks on Earth. This specific specimen appears to be water-worn, resulting in its smooth, rounded 'river stone' shape.
Field identification & locations
Identify in the field by looking for distinct parallel layers (bedding planes) and a gritty feel similar to sandpaper. Commonly found in riverbeds, canyons, and coastal areas.
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