sedimentary
Sandstone (Banded)
Arenite (SiO2 with iron oxide impurities)
Hardness: 6-7 (Mohs scale), Color: tan, brown, and gold bands, Luster: earthy/dull, Crystal structure: granular clastic, Cleavage: none, SG: 2.2-2.8
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Physical properties
Hardness: 6-7 (Mohs scale), Color: tan, brown, and gold bands, Luster: earthy/dull, Crystal structure: granular clastic, Cleavage: none, SG: 2.2-2.8
Formation & geological history
Formed through the accumulation and cementation of sand-sized mineral grains or rock fragments, typically in river beds or desert environments. The banding (Liesegang rings) is caused by the precipitation of iron oxides from groundwater.
Uses & applications
Used primarily in building construction as finishing stone, landscaping, and as a decorative garden rock. Fine-grained varieties are used for grindstones.
Geological facts
The distinctive circular patterns in this specimen are likely Liesegang rings, which are secondary chemical structures formed by the rhythmic precipitation of minerals within fluid-saturated rocks.
Field identification & locations
Identify by its gritty, sandpaper-like texture and visible banding. Commonly found in coastal areas, river banks, and sedimentary basins worldwide. Collectors look for unique banding patterns.
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