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tipical jointing of a felsic magma cooling with fractures developed on angles near to 90 degrees.
A magmatic Foliation is also visible, and it is given by Tourmaline spots developed on preferential layers.
PhotoID598

tipical jointing of a felsic magma cooling with fractures developed on angles near to 90 degrees.
A magmatic Foliation is also visible, and it is given by Tourmaline spots developed on preferential layers.
PhotoID598

Photograph: S. Papeschi

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