Sandstone (likely Quartzose Sandstone)

Physical Properties

Hardness: 6-7 (Mohs scale) if quartz-rich; Color: Tan, beige, or yellowish-brown; Luster: Dull/Earthy; Crystal structure: Clastic (grains); Cleavage: None; Grains often feel like sandpaper to the touch.

Formation & Geological History

Formed from the accumulation and cementation of sand-sized mineral grains or rock fragments. Produced in high-energy environments like deserts, beaches, or river deltas.

Uses & Applications

Construction material, road base, architectural stone, and as a reservoir rock for water, oil, and natural gas.

Geological Facts

Sandstone accounts for about 10-20% of all sedimentary rocks on Earth. Its porosity makes it a critical primary source for aquifers and petroleum reservoirs.

Field Identification & Locations

Identify by its gritty texture (feels like sandpaper) and visible sand grains. Found globally in continental shelf and desert regions. Collectors look for unique banding or fossil inclusions.

Identified on: 4/22/2026

Mode: Standard