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!
reach: rather globaldesertsdeserts of North AfricageologymineralsNorth Africarosessandtourismtourist attractionstourist attractions of North AfricaTunisia

Answers by country

in caves
in coal mines
in deserts
in extinct volcanoes
answers
flagFrance
10%
3%
75%
10%
28
flagPoland
9%
3%
68%
18%
25049
flagGermany
15%
5%
63%
13%
1030
flagItaly
16%
6%
62%
12%
50
flagthe Netherlands
16%
8%
60%
14%
48
flagUkraine
10%
19%
57%
10%
47
flagSwitzerland
15%
5%
56%
18%
116
flagthe United Kingdom
14%
7%
54%
19%
344
flagAustria
19%
10%
54%
12%
181
flagRepublic of Ireland
14%
2%
54%
28%
35
flagAustralia
27%
5%
51%
15%
92
flagColombia
7%
19%
43%
21%
41
flagUnknown
8%
29%
41%
17%
34
flagthe United States
30%
12%
39%
16%
866
flagCanada
35%
4%
36%
18%
65
flagIndia
21%
13%
35%
25%
361
flagNigeria
21%
12%
34%
21%
32
flagthe Philippines
24%
12%
33%
23%
89
flagthe United Arab Emirates
32%
16%
22%
24%
50
flagPakistan
27%
33%
21%
12%
33