Sandstone (Weathered)

Physical Properties

Hardness: 6-7 (on Mohs scale if quartz-based); Color: Tan, buff, or brownish-yellow; Luster: Dull or earthy; Crystal Structure: Clastic (sand-sized grains); Cleavage: None; Specific Gravity: 2.2–2.8

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. Often deposited in riverbeds, deltas, or deserts. This specific specimen shows significant rounded weathering, likely from fluvial (water) action.

Uses & Applications

Commonly used as a building material, in the manufacture of glass (if high quartz content), as a reservoir rock in the petroleum industry, and for landscaping.

Geological Facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. It is famous for creating iconic landscapes like the Grand Canyon and Antelope Canyon. Because it is porous, it acts as a natural filter for groundwater.

Field Identification & Locations

Identify in the field by its gritty texture (feels like sandpaper) and visible sand grains. These rounded 'river stones' are commonly found in glacier deposits or active/ancient stream beds. Collectors value unique cross-bedding patterns or fossil inclusions.

Identified on: 4/14/2026

Mode: Standard