Banded Sandstone (Quartzite-rich)

Physical Properties

Hardness: 6-7 on Mohs scale; Color: Reddish-brown with light tan or cream bands; Luster: Dull to earthy; Crystal structure: Granular/Microcrystalline; High specific gravity due to silica content.

Formation & Geological History

Formed through the accumulation and cementation of sand-sized mineral grains. The distinct banding is a result of changing environmental conditions during deposition, such as varying minerals (iron oxides) or grain sizes in alluvial or desert environments. This specimen likely dates from the Paleozoic or Mesozoic era.

Uses & Applications

Used primarily as decorative stone in landscaping, flagstone for walkways, and as an abrasive in industrial applications. Small specimens are popular for lapidary work and entry-level geology collections.

Geological Facts

The reddish-brown color is typically caused by hematite or other iron oxides acting as a cementing agent between quartz grains. Banded sandstone is the primary component of famous geological landmarks like the Antelope Canyon and Zion National Park.

Field Identification & Locations

Identify in the field by its distinct horizontal layering (bedding planes) and gritty texture. It will not react to acid (unlike limestone) and is hard enough to scratch glass if it is quartz-rich. Commonly found in arid plateau regions and riverbeds.

Identified on: 4/19/2026

Mode: Standard