Sandstone (Ferruginous)

Physical Properties

Hardness: 6-7 (Mohs scale), Color: Brownish-grey with orange-rusty staining, Luster: Dull/Earthy, Grainy texture, No visible cleavage, Gritty feel.

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. The orange-red staining suggests the presence of iron oxides that formed in a terrestrial or shallow marine environment with oxygen exposure.

Uses & Applications

Common sandstone is used in construction as building stone and gravel. This specific fragment is primarily of geological interest for studying local sedimentology or common field collecting.

Geological Facts

Sandstone is one of the most common types of sedimentary rock and often records ancient environments like deserts, beaches, or river beds. The iron staining is essentially 'rock rust'.

Field Identification & Locations

Identify by its gritty, sand-paper like feel and the visible clastic grains. It is commonly found in sedimentary basins and road cuts. Collectors should look for bedding planes or fossils within larger exposures.

Identified on: 4/26/2026

Mode: Standard