sedimentary
Sandstone (Wonderstone)
Clastic Sedimentary Rock (primarily SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, purple, and red banding; Luster: Dull to earthy; Structure: Granular clastic texture; Cleavage: None; Specific Gravity: 2.2-2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, purple, and red banding
- Luster
- Dull to earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, purple, and red banding; Luster: Dull to earthy; Structure: Granular clastic texture; Cleavage: None; Specific Gravity: 2.2-2.8
Formation & geological history
Formed from the lithification of sand-sized mineral particles or rock fragments. The distinctive banding (Liesegang rings) is caused by the precipitation of iron oxides and other minerals from groundwater moving through porous rock.
Uses & applications
Used primarily as decorative landscaping stone, in lapidary work for cabochons, and as a material for carvings and bookends.
Geological facts
The rhythmic banding patterns, known as Liesegang rings, are often mistaken for wood grain or fossilized remains, but they are chemical precipitation occurrences within the rock after deposition.
Field identification & locations
Identify in the field by its sandy texture and rhythmic, flowing color bands. Commonly found in arid regions of the Southwestern United States, particularly Utah, Nevada, and Arizona.
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