sedimentary
Weathered Sandstone Cobble
Arenite / Quartz Sandstone
Hardness: 6-7 (if quartz-rich); Color: Tan, brownish-grey with iron staining; Luster: Dull/Earthy; Texture: Fine-grained, gritty feel; Cleavage: None
- Hardness
- 6-7 (if quartz-rich)
- Color
- Tan, brownish-grey with iron staining
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (if quartz-rich); Color: Tan, brownish-grey with iron staining; Luster: Dull/Earthy; Texture: Fine-grained, gritty feel; Cleavage: None
Formation & geological history
Formed through the accumulation, compaction, and cementation of sand-sized mineral grains or rock fragments. This specimen shows significant rounding due to water erosion (fluvial or beach action).
Uses & applications
Construction aggregate, architectural stone, and often used as educational specimens for teaching erosion and sedimentary processes.
Geological facts
Sandstone makes up about 20-25% of all sedimentary rocks on Earth. The dark patches on this specimen are likely manganese or iron oxide staining resulting from chemical weathering.
Field identification & locations
Identify by its 'sandpaper' feel and visible grain structure. Commonly found in riverbeds, glacial tills, and coastal areas throughout the world.
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