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
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flagFrance
6%
6%
80%
6%
15
flagGreece
18%
9%
72%
0%
11
flagAustria
9%
18%
68%
0%
22
flagPoland
9%
3%
67%
18%
21503
flagNew Zealand
20%
0%
66%
13%
15
flagPortugal
0%
8%
66%
8%
12
flagthe Netherlands
7%
7%
64%
21%
14
flagGermany
16%
3%
62%
17%
181
flagSwitzerland
16%
10%
60%
10%
30
flagthe United Kingdom
9%
8%
55%
22%
163
flagAustralia
22%
6%
48%
24%
50
flagthe United States
25%
12%
42%
16%
420
flagIndia
17%
12%
41%
24%
210
flagUnknown
8%
29%
41%
17%
34
flagthe Philippines
27%
4%
40%
15%
44
flagCanada
36%
4%
39%
14%
41
flagRepublic of Ireland
18%
9%
36%
36%
11
flagthe United Arab Emirates
16%
50%
33%
0%
12
flagPakistan
28%
24%
28%
12%
25
flagNigeria
9%
9%
18%
45%
11