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	 Pentahydrite Mineral Data  |  |  | 
   
| General Pentahydrite  Information  | 
|  Chemical  Formula: | MgSO4•5(H2O) | 
|  Composition: | Molecular Weight = 210.45 gm | 
|  | Magnesium  11.55 %  Mg   19.15 % MgO | 
|  | Hydrogen    4.79 %  H    42.80 % H2O | 
|  | Sulfur     15.24 %  S    38.05 % SO3 | 
|  | Oxygen     68.42 %  O | 
|  | ______        ______ | 
|  | 100.00 %      100.00 % = TOTAL OXIDE | 
|  Empirical Formula: | Mg(SO4)•5(H2O) | 
|  Environment: | Pseudomorphs of dehydration of epsomite. | 
|  IMA Status: | Valid Species (Pre-IMA) 1951 | 
|  Locality: | The Geysers, Sonoma County, California, USA. Link to MinDat.org Location Data. | 
|  Name Origin: | Named from the Greek, penta, "five" and hydros "water" in allusion to the 5 water molecules in the formula. | 
|  Name Pronunciation: | Pentahydrite  + Pronunciation   | 
|  Synonym: | ICSD 2776 | 
|  | PDF 25-532 | 
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