The felspathoid minerals, sodalite, haiiyne and nosean, which crystallize in isometric dodecahedra, are very frequent components of the phonolites; their crystals are often corroded or partly dissolved and their outlines may then be very irregular.
Luzi, who found that it can be corroded by the solvent action of fused blue ground; from the experiments of J.
Cables have frequently been picked up showing after many years of submergence no appreciable deterioration in this respect, while in other cases ends have been picked up which in the course of twelve years had been corroded to needle points, the result probably of metalliferous deposits in the locality.
All are built in the Doric style, of the local porous stone, which is of a warm red brown colour, full of fossil shells and easily corroded when exposed to the air.
It so chanced that almost upon first cutting into him with the spade, the entire length of a corroded harpoon was found imbedded in his flesh, on the lower part of the bunch before described.