sedimentary
Sandstone Pebbles
Arenite (Sedimentary rock composed of sand-sized grains)
Hardness: 6-7 (Mohs scale), Color: tan, yellow, brownish-green, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.3-2.4
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, yellow, brownish-green, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic, Specific Gravity: 2.3-2.4
Formation & geological history
Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) usually in river beds, deserts, or marine environments. These specimens often show rounding due to water erosion.
Uses & applications
Commonly used in construction as aggregate, landscaping, architectural stone, and occasionally for making grindstones or aquifers.
Geological facts
Sandstone accounts for roughly 20 to 25 percent of all sedimentary rocks on Earth. It can preserve fossils and is a major reservoir for groundwater and petroleum.
Field identification & locations
Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in basins and near current or former water bodies. Check for layering (bedding).
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