Sandstone (with potential Arkose/Lithic characteristics)

Physical Properties

Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, light brown; Luster: Dull/Earthy; Structure: Clastic; Gritty texture similar to sandpaper; Porous and often shows some layering.

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. Typically deposited in river beds, beaches, or deserts and lithified over millions of years under pressure and heat.

Uses & Applications

Commonly used in construction for paving, building facades, and grindstones. In geology, it is a significant reservoir for groundwater and oil/gas due to its porosity.

Geological Facts

Sandstone accounts for roughly 20-25% of all sedimentary rock on Earth. The famous Red Rocks of Colorado and the carvings of Petra, Jordan, are both made of sandstone.

Field Identification & Locations

Identify in the field by its 'sandpaper' feel. It will not react with acid unless the cementing material is calcite. Grain size is key (0.06mm to 2mm). Found globally in sedimentary basins.

Identified on: 4/20/2026

Mode: Standard