Sandstone (Quartzose)

Physical Properties

Hardness: 6-7 (individual grains); Color: Reddish-tan to brown; Luster: Dull, earthy; Structure: Clastic, granular texture; Cleavage: None; Specific Gravity: 2.2-2.8

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains, typically in river beds, beaches, or deserts. This specimen appears water-worn, likely from a stream or coastal environment. Geological age varies by location, often millions of years old.

Uses & Applications

Used widely in construction as a building stone, in glass manufacturing (if high purity silica), and as a common landscaping or decorative stone.

Geological Facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The red/brown color in specimens like this is usually due to iron oxide (hematite) acting as a cementing agent.

Field Identification & Locations

Identify in the field by its 'sandpaper' feel and visible granular texture. It will often scratch glass if it is quartz-rich. Found in sedimentary basins globally.

Identified on: 4/22/2026

Mode: Standard