BGS Linked Open Data


Tephri-phonolite ['Tephri-phonolite - A type of phonolitic-rock, classified using the total alkali silica (TAS) classification. The TAS classification may be used if the mineral mode of a normal fine-grained crystalline rock cannot be determined due either to the presence of glass or to the fine-grained nature of the rock. The definition of tephri-phonolite is as shown in British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17b, 20.'] ['stable'] [''] ['TEPPNT'] ['Tephri-phonolite'] [''] [''] [''] ['Tephri-phonolite']