Sandstone (Gneissic or Banded)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Gray, tan, and dark streaks; Luster: Dull/Earthy; Structure: Fine-grained with visible layering/bedding; Specific Gravity: 2.2–2.8

Formation & Geological History

Formed by the accumulation and lithification of mineral particles or rock fragments. The visible bands represent different layers of sediment deposited over time in a marine or river environment.

Uses & Applications

Used primarily in construction, decorative landscaping, and as a common find for collectors of river-worn stones.

Geological Facts

Sandstone accounts for approximately 20-25% of all sedimentary rocks on Earth. This specific specimen appears to be water-worn, resulting in its smooth, rounded 'river stone' shape.

Field Identification & Locations

Identify in the field by looking for distinct parallel layers (bedding planes) and a gritty feel similar to sandpaper. Commonly found in riverbeds, canyons, and coastal areas.

Identified on: 4/13/2026

Mode: Standard