sedimentary

Sandstone (likely with Borings or Vesicular Basalt)

Clastic Sedimentary Rock (Sandstone)

Hardness: 6-7 (approximate); Color: Tan, brown, or grayish-brown; Luster: Dull/Earthy; Crystal structure: Granular/Clastic texture; Cleavage: None; Specific gravity: 2.2-2.8. Small holes (vesicles or borings) are visible on the surface.

Hardness: 6-7 (approximate)
Color: Tan, brown, or grayish-brown
Luster: Dull/Earthy

Identified April 12, 2026More sedimentary →

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Physical properties

Formation & geological history

Formed through the accumulation and cementation of sand-sized mineral particles or rock fragments. The holes may be 'vesicles' from gas bubbles in a volcanic precursor, or more likely 'borings' from marine organisms if found near a coast, or simple erosional pits.

Uses & applications

Commonly used in construction as a building material, road base, or for decorative landscaping. In industry, high-silica sandstone is used in glassmaking.

Geological facts

Sandstone represents about 20-25% of all sedimentary rocks on Earth. The color is usually determined by the cementing material; iron oxides create reds and browns, while silica or calcite create tans and whites.

Field identification & locations

Identify by its 'sandpaper' feel and granular appearance. It can be found globally in deserts, riverbeds, and ocean basins. For collectors, look for unique textures or fossils within the layers.

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