Sandstone (likely Red/Brown Sandstone)

Physical Properties

Hardness: 6-7 on Mohs scale (depending on cementation); Color: Tan, brown, reddish-brown; Luster: Dull or earthy; Crystal structure: Clastic/Granular; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. Often formed in desert, river, or coastal environments over millions of years.

Uses & Applications

Widely used in construction for flagstone, paving, and building facades. Also used as a primary source of silica for glass manufacturing and as abrasive material.

Geological Facts

Sandstone makes up about 10-20% of the Earth's total sedimentary rock. It is a major reservoir for groundwater and oil/gas fields due to its high porosity.

Field Identification & Locations

Identify in the field by its gritty 'sandpaper' texture. Common in arid regions and canyonlands. Collectors look for unique banding patterns (Liesegang rings) or fossil inclusions.

Identified on: 4/26/2026

Mode: Standard