Sandstone (Quartzose)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Grayish-brown to reddish; Luster: Dull/Earthy; Crystal Structure: Clastic granular; Cleavage: None; Specific Gravity: 2.2-2.8. Smooth, water-worn texture.

Formation & Geological History

Formed through the accumulation and cementation of mineral particles or rock fragments (detritus) of sand size. This specimen shows significant rounding from fluvial or marine erosion, common in riverbeds or coastal environments.

Uses & Applications

Commonly used in construction, paving, landscaping, and as a raw material for glass manufacturing if high in silica content.

Geological Facts

Sandstone makes up about 10-20% of all sedimentary rocks on Earth. Its porosity makes it an excellent reservoir for groundwater, oil, and natural gas.

Field Identification & Locations

Identify in the field by its gritty 'sandpaper' feel and visible grains. This specific shape indicates it is a 'river rock' or 'cobble' shaped by water transport. Found globally in basins and river outcrops.

Identified on: 4/29/2026

Mode: Standard