phonolitic trachyte
1Trachyte — is an igneous, volcanic rock with an aphanitic to porphyritic texture. The mineral assemblage consists of essential alkali feldspar; relatively minor plagioclase and quartz or a feldspathoid such as nepheline may also be present. (See the QAPF… …
2North Berwick Law — seen from the seafront of North Berwick Elevation …
3Mount Erebus — Mt. Erebus Mount Erebus, 1972 Elevation 3,794 m (12,448 ft) …
