Great Balls Of Fire
Carlo Forte (November)
I came across these Ã¢Â.Â.cannonballsÃ¢Â.Â. on the side of Moel Hebog whislt out walking with a group yesterday.
Although there can be several reasons for their formation, these particular Ã¢Â.Â.concretionsÃ¢Â.Â. are the result of crystallization of silica rich fluids during the cooling of volcanic ash flow.
As the intense-heat of the flow subsided this silca-rich substance cooled and the silica crystals began to gather in concentric layers eventually resulting in these impressive nodules.