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