Rock 366 : Day 49 : Sillimanite Hornfels

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Day 49 : Sillimanite Hornfels, part of a pelitic xeonlith in the Thorr Granodiorite, Co. Donegal, Ireland.  Keele Collection. Weathered surface above and cut section below.

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~ by hypocentre on February 19, 2012.

 
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