Sandstone or Limestone

Physical Properties

Medium hardness depending on cementation, light gray to tan color, dull luster, composed of sand-sized grains or calcium carbonate, often porous.

Formation & Geological History

Formed by the accumulation and cementation of sand-size mineral particles or calcium carbonate precipitates in ancient depositional environments like beaches, deserts, or shallow marine settings.

Uses & Applications

Commonly used in construction, landscaping, as dimension stone, and occasionally in glass manufacturing if high in silica.

Geological Facts

Sandstone is highly porous and often serves as a reservoir rock for groundwater, oil, and natural gas.

Field Identification & Locations

Identified by its granular texture and light color. It may fizz with dilute acid if it contains calcium carbonate (limestone). Common worldwide in sedimentary basins.

Identified on: 4/26/2026

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