sedimentary
Sandstone
Arenite
AI-generated identification · may be incorrectHardness: 6-7 (Mohs scale), Color: Gray to tan with slight reddish layers, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic texture, Specific Gravity: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Gray to tan with slight reddish layers, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic texture, Specific Gravity: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains (mostly quartz) in environments like riverbeds, beaches, or deserts. This specimen is water-worn and rounded, suggesting a fluvial or glacial transport history.
Uses & applications
Used primarily in building construction as a dimension stone, as an abrasive in grinding, and in high-quality specimens for garden ornaments or landscaping.
Geological facts
Sandstone makes up about 20% of all sedimentary rocks on Earth. Depending on the cement, it can be extremely durable or easily weathered; this specimen appears well-indurated.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering (bedding planes). Frequently found in riverbeds and mountainous outcrop regions.
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