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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4%
4%
78%
13%
23
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21%
5%
73%
0%
19
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9%
3%
67%
18%
22995
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18%
10%
65%
4%
49
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16%
4%
62%
14%
380
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11%
20%
57%
8%
45
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13%
8%
56%
21%
23
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14%
7%
55%
18%
54
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23%
4%
53%
17%
69
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13%
8%
51%
21%
230
flagItaly
20%
5%
50%
20%
20
flagRepublic of Ireland
10%
5%
50%
35%
20
flagColombia
5%
20%
46%
20%
39
flagthe United States
26%
12%
42%
15%
496
flagCanada
34%
4%
42%
14%
47
flagUnknown
8%
29%
41%
17%
34
flagthe Philippines
26%
4%
40%
19%
61
flagIndia
19%
13%
37%
25%
277
flagPakistan
29%
29%
22%
12%
31
flagNigeria
16%
11%
22%
33%
18