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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Answers by country

in caves
in coal mines
in deserts
in extinct volcanoes
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flagFrance
7%
3%
76%
11%
26
flagGreece
20%
5%
70%
5%
20
flagPoland
9%
3%
67%
18%
23848
flagGermany
14%
5%
63%
14%
540
flagthe Netherlands
15%
5%
63%
15%
38
flagSwitzerland
12%
6%
59%
17%
74
flagUkraine
10%
19%
58%
8%
46
flagAustria
16%
13%
56%
12%
99
flagRepublic of Ireland
15%
3%
56%
25%
32
flagItaly
14%
7%
55%
14%
27
flagthe United Kingdom
14%
8%
53%
19%
282
flagAustralia
22%
5%
52%
18%
75
flagColombia
5%
20%
45%
22%
40
flagthe United States
25%
11%
44%
16%
543
flagCanada
33%
3%
41%
15%
53
flagUnknown
8%
29%
41%
17%
34
flagthe Philippines
22%
8%
39%
22%
74
flagIndia
21%
13%
35%
26%
314
flagthe United Arab Emirates
25%
20%
25%
27%
40
flagPakistan
28%
31%
21%
12%
32