sedimentary
Sandstone (with Liesegang rings or Oxidation)
Arenite (primarily Quartz SiO2 with Iron Oxide Fe2O3 staining)
Hardness: 6-7 (Mohs scale); Color: Grayish-tan exterior with reddish-brown oxidation rings; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
- Hardness
- 6-7 (Mohs scale)
- Color
- Grayish-tan exterior with reddish-brown oxidation rings
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 (Mohs scale); Color: Grayish-tan exterior with reddish-brown oxidation rings; Luster: Dull/Earthy; Crystal structure: Granular/Clastic; Cleavage: None
Formation & geological history
Formed from the lithification of sand-sized grains deposited in environments like rivers or deserts. The reddish patterns (Liesegang rings) occur when mineral-rich groundwater precipitates iron oxides in the rock pores over thousands of years.
Uses & applications
Used primarily as construction material, paving stones, and as a source of high-purity silica for glass manufacturing. Smaller, uniquely patterned pieces are popular for amateur rock collecting.
Geological facts
This specimen displays chemical weathering patterns known as oxidation rinds. The red center is caused by iron 'rusting' within the stone when exposed to moisture and oxygen.
Field identification & locations
Identify in the field by its gritty texture (feels like sandpaper) and visible layering or staining. It is commonly found in sedimentary basins and canyon walls globally.
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