sedimentary

Vesicular Sandstone

Clastic Sedimentary Rock (Sandstone)

Hardness: 6-7 (Mohs), Color: Buff, tan, or yellowish-brown, Luster: Dull/Earthy, Crystal Structure: Granular/Clastic texture, Cleavage: None, Specific Gravity: 2.2-2.8. Features rounded pits or 'vesicles' from weathered-out inclusions.

Identified May 16, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed from the accumulation and cementation of sand-sized minerals (mostly quartz) and rock grains. The pitted surface likely results from the differential weathering and dissolution of softer calcite nodules or fossils within the matrix over geological timescales, or from being tumbled in water.

Uses & applications

Mainly used in construction as an abrasive, for building stone, and as a reservoir rock for oil and gas. For collectors, it is an example of lithification and differential weathering.

Geological facts

Sandstone is one of the most common sedimentary rocks on Earth. The 'holes' in this specimen often occur when acidic rainwater dissolves limestone or shell fragments that were originally trapped inside the sand layers.

Field identification & locations

Identify by its gritty, sandpaper-like feel and the presence of small visible grains. Commonly found in riverbeds, deserts, and coastal areas. This specific texture is typical of stream-tumbled fieldstones.

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