Rock 365 : Day 67 : Mantle Xenoliths #365photos

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Day 67 : These are olivine-rich mantle xenoliths in a basalt. The sample was one of the first I collected as an A-level geology student many years ago from the Carboniferous volcanic vent at Calton Hill, near Buxton on the edge of the Peak District.  Since I collected this sample much of the quarry has been in-filled with domestic refuse and what exposure remains is heavily weathered.  Fresh samples like this are hard to obtain now.

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~ by hypocentre on March 8, 2010.

 
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