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Geology of NI
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image: Detail of vesicle cylinders in array; basalt of cylinder more prone to weathering than massive heart of flow; dark pits represent amygdaloids; only rarely is secondary (white) infilling of zeolite/calcite preserved.
Detail of vesicle cylinders in array; basalt of cylinder more prone to weathering than massive heart of flow; dark pits represent amygdaloids; only rarely is secondary (white) infilling of zeolite/calcite preserved.
 
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