sedimentary

Sandstone (Quartzose)

Arenite (primarily SiO2)

Hardness: 6-7 (individual grains); Color: tan, buff, and light brown with distinct bedding laminations; Luster: dull/earthy; Crystal structure: clastic texture with well-rounded sand grains; Cleavage: none; Specific gravity: 2.2 - 2.8.

Hardness: 6-7 (individual grains)
Color: tan, buff, and light brown with distinct bedding laminations
Luster: dull/earthy

Identified July 11, 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, typically in riverbeds, deltas, or beaches. Given the location near Minot, ND (48.2N, 101.3W), this is likely a stream-transported cobble from regional Cenozoic or Mesozoic sedimentary formations.

Uses & applications

Used widely as construction material, paving, grindstones and for architectural cladding. Small, rounded cobbles like this are common in landscaping and as decorative garden stones.

Geological facts

Sandstone makes up about 20% of all sedimentary rocks on Earth. The rhythmic layering visible on the surface of this specimen represents seasonal or tidal changes in deposition during the rock's formation.

Field identification & locations

Identify by its gritty texture (feels like sandpaper) and visible layering (bedding). It is extremely common in the Great Plains of North Dakota. Collectors look for unique banding patterns known as Liesegang rings.