Sandstone

Physical Properties

Hardness: 6-7 on Mohs scale (due to quartz content); Color: Tan, beige, or grey with a salt-and-pepper look; Luster: Dull or earthy; Texture: Granular, sandpaper-like feel; Structure: Clastic

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. These grains are typically weathered from pre-existing rocks and transported by water, wind, or ice before being buried and lithified.

Uses & Applications

Widely used as a construction material for paving, masonry, and architectural carvings. It is also an important aquifer and petroleum reservoir rock in the energy industry.

Geological Facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. Famous landmarks like the Grand Canyon or the Red Rocks of Sedona are primarily composed of various sandstone layers.

Field Identification & Locations

Identify in the field by its distinct gritty texture that feels like sandpaper to the touch. Look for visible sand grains and occasional layering (bedding). Rubbing two pieces together will often release sand grains.

Identified on: 4/20/2026

Mode: Standard