. . . "stable"@en . "PNTEP"@en . "Phonolitic-tephrite - A type of tephritic-rock. In the Rock Classification Scheme, this name is used for a fine-grained crystalline igneous rock when the modal mineralogy is available, and the mineral mode plots in field 13 of the quartz - alkali feldspar - plagioclase - feldspathoid (QAPF) diagram. Phonolitic-basanite and phonolitic-tephrite are distinguished by the amount of olivine in the CIPW norm: if normative olivine is less than 10% the rock is phonolitic-tephrite. British Geological Survey Research Report RR/99/06, section 5.2 and figs. 17a, 19."@en . "Phonolitic-tephrite"@en . . . "Phonolitic-tephrite"@en .