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
answers
flagFrance
10%
3%
75%
10%
29
flagPoland
9%
3%
68%
18%
25384
flagGermany
16%
5%
63%
13%
1173
flagthe Netherlands
14%
9%
62%
12%
54
flagItaly
17%
5%
61%
11%
52
flagUkraine
10%
18%
57%
12%
49
flagSwitzerland
15%
5%
56%
19%
140
flagRepublic of Ireland
13%
2%
56%
27%
37
flagthe United Kingdom
14%
8%
55%
19%
361
flagAustria
19%
10%
54%
12%
191
flagAustralia
28%
5%
48%
16%
96
flagColombia
7%
19%
43%
21%
41
flagthe United States
29%
11%
41%
16%
916
flagUnknown
8%
29%
41%
17%
34
flagCanada
34%
4%
37%
18%
66
flagIndia
21%
13%
35%
25%
368
flagNigeria
21%
12%
34%
21%
32
flagthe Philippines
25%
14%
32%
22%
92
flagthe United Arab Emirates
33%
15%
21%
23%
51
flagPakistan
27%
33%
21%
12%
33