Sandstone (Quartzite-rich)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Tan, beige, or light brown; Luster: Dull to earthy; Crystal structure: Granular/Clastic; Cleavage: None; Specific gravity: approx. 2.2-2.8

Formation & Geological History

Formed through the accumulation and cementation of mineral particles or rock fragments (clasts) the size of sand. This specimen shows signs of water erosion (river-worn smoothing).

Uses & Applications

Used widely in construction as a building stone or road base; if pure quartz, it can be used for glassmaking.

Geological Facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The reddish or tan colors often come from iron oxide impurities.

Field Identification & Locations

Identify by its gritty texture (feels like sandpaper) and visible grains. Often found in riverbeds, deserts, and coastal areas.

Identified on: 4/14/2026

Mode: Standard