Where are such formations usually found?

in caves
in coal mines
in deserts
in extinct volcanoes
Desert rose is the colloquial name given to rosette formations of crystal clusters of gypsum or baryte which contain abundant sand grains. Desert roses occur when the crystals form in arid sandy conditions, such as the evaporation of a shallow salt basin.
Carlos Salto
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Very interesting!
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in caves
in coal mines
in deserts
in extinct volcanoes
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flagFrance
4%
4%
78%
13%
23
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17%
5%
76%
0%
17
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11%
11%
73%
0%
34
flagPoland
9%
3%
67%
18%
22305
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20%
0%
66%
13%
15
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0%
8%
66%
8%
12
flagGermany
13%
4%
64%
15%
304
flagthe United Kingdom
11%
8%
55%
21%
181
flagthe Netherlands
11%
5%
55%
27%
18
flagSwitzerland
19%
9%
50%
16%
42
flagAustralia
25%
5%
48%
20%
60
flagRepublic of Ireland
11%
5%
47%
35%
17
flagthe United States
26%
12%
43%
16%
476
flagCanada
34%
4%
41%
15%
46
flagUnknown
8%
29%
41%
17%
34
flagthe Philippines
26%
5%
40%
19%
57
flagIndia
19%
12%
39%
24%
257
flagthe United Arab Emirates
15%
46%
38%
0%
13
flagPakistan
27%
27%
24%
13%
29
flagNigeria
11%
11%
23%
35%
17