Sandstone

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Brown, tan, reddish-brown; Luster: Dull or 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, typically in river beds, deserts, or coastal environments. This specimen shows a clastic texture indicative of high energy deposition.

Uses & Applications

Widely used as a construction material, for architectural stone, paving, and occasionally for grindstones or industrial sand applications.

Geological Facts

Sandstone makes up about 20-25% of all sedimentary rocks on Earth and is highly porous, making it a critical reservoir for groundwater and oil.

Field Identification & Locations

Identify by its gritty, sandpaper-like feel and the visible small grains. Common worldwide in sedimentary basins. Collectors often look for colorful banding or fossil inclusions.

Identified on: 5/3/2026

Mode: Standard