1. 
   Siderotil
   Siderotil is an iron(II) sulfate hydrate mineral with formula: FeSO4·5H2O which forms by the dehydration of melanterite. Copper commonly occurs substituting for iron in the structure. It typically occurs as fibrous or powdery encrustations, but may also occur as acicular triclinic crystals. It was...
   Found op http://en.wikipedia.org/wiki/Siderotil
   
   
2. 
   siderotil
   siderotil: see ferrous sulfate.
   Found op http://www.infoplease.com/ce6/sci/A0918748.html
   
   

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