Rock 365 : Day 164 : Mylonitic Augen Gneiss

20100613

Day 164 : A megacrystic mylonitised feldspar augen gneiss from a Hercynian granite protolith in the South Brittany Shear Zone. From Marzan, near La Roche-Bernard, Southern Brittany, France. Keele Collection.

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~ by hypocentre on June 13, 2010.

 
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