sedimentary
Sandstone with Bedding Planes
Arenite (Sedimentary rock composed primarily of sand-sized minerals)
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, brown, and grey with visible layering; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (breaks across grains).
- Hardness
- 6-7 (Mohs scale) if quartz-rich
- Color
- Tan, brown, and grey with visible layering
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, brown, and grey with visible layering; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None (breaks across grains).
Formation & geological history
Formed from the accumulation and lithification of sand-sized grains, typically in riverbeds, deserts, or marine environments. The visible lines represent different pulses of sedimentation over time, creating distinct bedding planes.
Uses & applications
Commonly used as a building stone (ashlar), for decorative paving, and as an aquifer in geological reservoirs. Finely ground sandstone is used in glass manufacturing if the quartz content is high.
Geological facts
Sandstone accounts for approximately 20% of all sedimentary rocks on Earth. The distinct bands or layers seen in this specimen are called laminations or beds, which record the history of an ancient environment's energy levels.
Field identification & locations
Identify in the field by its gritty, sandpaper-like feel and the presence of parallel layers (bedding). It is found globally in sedimentary basins. Collectors should look for specimens with Sharp cross-bedding or fossil inclusions.
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