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Gypsum.
Description from the source:
Gypsum (Ca SO4x2 H2O mon.), desert of Morocco. Geminate crystals with sand inclusions. 3x2,7x1,2 cm; 6 g.
Source:
Simone Citon
Contributor:
John Gray
Acquired:
10 January, 2009
Text Updated:
10 January, 2009
Price:
Trade
Size:
1.2"
Composition:
Ca
S
O
4
.
2
H
2
O