Sandstone (likely Quartzose Sandstone)

Physical Properties

Hardness: 6-7 (on Mohs scale if quartz-rich); Color: Tan, beige, grey; Luster: Dull/Earthy; Crystal structure: Granular/Clastic texture; Cleavage: None (breaks across grains); Specific gravity: 2.2-2.8

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments. This specimen appears weathered/water-worn, indicating transport by water or wind before lithification.

Uses & Applications

Commonly used in construction for building stone, road base, or crushed stone. Highly pure quartz sandstone is used in glass manufacturing.

Geological Facts

Sandstone accounts for roughly 20-25% of all sedimentary rocks on Earth. It often contains significant aquifers and petroleum reservoirs due to its porosity.

Field Identification & Locations

Identify in the field by its 'gritty' feel (like sandpaper) and visible sand grains. This specific piece has a flat, elongated shape likely smoothed by fluvial (river) or coastal erosion.

Identified on: 4/21/2026

Mode: Standard