Sandstone (likely Siltstone or fine-grained Sandstone)

Physical Properties

Hardness: 6-7 (Mohs scale), Color: tan, buff, or brownish-yellow, Luster: dull to earthy, Crystal structure: granular clastic texture, 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 (clasts). Often formed in river beds, deserts, or coastal environments over millions of years.

Uses & Applications

Commonly used as a building material, in flagstone for paving, for making grindstones, or as an ornamental stone in landscaping.

Geological Facts

Sandstone accounts for about 20% of all sedimentary rocks on Earth. Some of the most iconic landscapes in the world, like the Grand Canyon and Petra, are carved from sandstone.

Field Identification & Locations

Identify in the field by its gritty texture (feels like sandpaper) and visible layers or bedding. It is frequently found in arid regions, river valleys, and along ancient coastlines.

Identified on: 4/14/2026

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