sedimentary
Sandstone (specifically Picture Sandstone or Wonderstone)
Arenite (composed primarily of SiO2)
Hardness: 6-7 on Mohs scale; Color: Tan, brown, ochre, and cream; Luster: Dull/Earthy; Crystal Structure: Clastic (granular); Cleavage: None; Specific Gravity: 2.2 - 2.8
- Hardness
- 6-7 on Mohs scale
- Color
- Tan, brown, ochre, and cream
- Luster
- Dull/Earthy
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Physical properties
Hardness: 6-7 on Mohs scale; Color: Tan, brown, ochre, and cream; Luster: Dull/Earthy; Crystal Structure: Clastic (granular); Cleavage: None; Specific Gravity: 2.2 - 2.8
Formation & geological history
Formed through the accumulation of sand-sized mineral grains or rock fragments, subsequently lithified by mineral cement (silica or calcium carbonate). The rhythmic banding is caused by rhythmic precipitation of iron oxide (Liesegang rings) within the porous stone.
Uses & applications
Used extensively in construction as dimension stone, for landscaping/outdoor decor, and in artistic lapidary work for 'picture' stones and coasters.
Geological facts
The banding, known as Liesegang rings, is named after the chemist Raphael E. Liesegang. These patterns often mimic landscapes, leading to the name 'Picture Sandstone'.
Field identification & locations
Identify in the field by its gritty texture and visible alternating bands of color. It is commonly found in the American Southwest (Utah and Arizona). Collectors should look for high contrast in the banding and distinct 'landscape' features.
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