sedimentary
Sandstone (lithic wacke/arenite)
Clastic sedimentary rock (primarily SiO2)
Hardness: 6-7 (Mohs scale), Color: Tan to greyish-brown, Luster: Dull/Earthy, Crystal structure: Granular/Clastic, Cleavage: None, Specific Gravity: 2.2 - 2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: Tan to greyish-brown, 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 sand-sized mineral grains or rock fragments. This specimen appears water-worn, likely shaped by river or glacial transport over thousands to millions of years.
Uses & applications
Primary uses include construction aggregate, road base, and dimension stone for buildings. Fine-grained varieties are used in glass making or as grindstones.
Geological facts
Sandstone makes up approximately 20% of all sedimentary rocks on Earth and is a major reservoir for groundwater and petroleum due to its porosity.
Field identification & locations
Identify by its gritty, sandpaper-like feel and visible grains. Found globally in riverbeds, deserts, and coastal regions. For collectors, look for unique weathering patterns or cross-bedding structures.
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