Sandstone (Quartzose)

Physical Properties

Hardness: 6.5-7 (Mohs); Color: Tan, beige, pinkish-buff; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None; Feel: Gritty like sandpaper.

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains, typically quartz. This specimen shows significant rounding, suggesting a high-energy environment like a riverbed or beach before lithification.

Uses & Applications

Used widely as a construction material (building stone), glass manufacturing (if high purity quartz), and as an abrasive.

Geological Facts

Sandstone contains a record of the past, often preserving ripples from ancient water or footprints of animals. It is one of the most common sedimentary rocks on Earth's surface.

Field Identification & Locations

Identify in the field by its sandpaper-like texture and visible sand grains. It will often scratch glass if quartz-rich. Commonly found in deserts, river basins, and coastal areas.

Identified on: 4/24/2026

Mode: Standard