  Hematite.  
Description from the source: 
Hematite ps. Magnetite (Fe2 O3 trig.), Payun Matri, Volcano, Mendosa, Argentina. Micro laminar crystals after Magnetite. 3x2,5x2,5 cm; 15 g. 
Source: Simone Citon 
Contributor: John Gray 
Acquired: 10 January, 2009 
Text Updated: 10 January, 2009 
Price: Trade 
Size: 1.2" 
Composition: Fe2O3
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