  Siderite.  
Description from the source: 
Siderite (Fe+2 CO3 trig.), Bad Ems, Germany. Cleavaged masses, typic. 3,6x2x2 cm the bigger; 36 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 11 March, 2009 
Text Updated: 12 March, 2009 
Price: Trade 
Size: 1.4" 
Composition: FeCO3
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