sedimentary

Sandstone

Arenite (Sedimentary Rock)

Hardness: 6-7 Mohs; Color: Tan, brown, ochre; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of sand-sized mineral grains/rock fragments); Cleavage: None; Specific Gravity: 2.2-2.8

Hardness: 6-7 Mohs
Color: Tan, brown, ochre
Luster: Dull/Earthy

Identified June 21, 2026More sedimentary →

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Physical properties

Hardness: 6-7 Mohs; Color: Tan, brown, ochre; Luster: Dull/Earthy; Crystal Structure: Clastic (composed of sand-sized mineral grains/rock fragments); Cleavage: None; Specific Gravity: 2.2-2.8

Formation & geological history

Formed through the accumulation of sand-sized minerals (mostly quartz and feldspar) in environments like deserts, riverbeds, and beaches. The sample shows distinct Liesegang rings (reddish bands) formed by chemical precipitation from groundwater.

Uses & applications

Used widely as a building and paving material, in glass manufacturing (if high silica content), and as an aquifer in geology due to its porosity.

Geological facts

The banding visible in this specimen, known as Liesegang banding, is a phenomenon where minerals like iron oxide precipitate in rhythmic patterns within fluid-saturated rocks.

Field identification & locations

Identify in the field by its gritty, sand-like texture and visible layered or banded patterns. It often feels like sandpaper. Common in arid regions and coastal cliffs.