sedimentary
Sandstone (Banded)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 Mohs scale; Color: Grey, tan, and light purple banding; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2 - 2.8
- Hardness
- 6-7 Mohs scale
- Color
- Grey, tan, and light purple banding
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 Mohs scale; Color: Grey, tan, and light purple banding; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: 2.2 - 2.8
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in marine or desert environments. This specific specimen shows distinct bedding planes (banding) and water-worn smoothing, suggesting a history in a riverbed or coastal area.
Uses & applications
Commonly used as a building material, in the manufacture of glass (if high silica content), and as an abrasive. Smooth, banded specimens are often collected as 'pocket stones' or used in landscaping.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The visible stripes are called 'bedding' and represent different periods of sediment deposition, often over thousands of years.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible layers. Commonly found in basins, riverbeds, and ancient sea beds. Collectors look for unique banding patterns like those seen in 'Wonderstone' or artistic 'Picture Sandstone'.
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