Tephrite is foidal basalt with essential calic plagioclase but without essential olivine.
2.
It occurs within a xenolith in a leucite tephrite.
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At Vesuvius it occurs as alterations from gypsum within leucite tephrite and as fumarole deposits.
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The field is dominated by trachyandesite and trachydacite, ranging from tephrite over trachyandesite to trachyte and rhyolite.
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Its geology consists of the formation known as the Old Volcanic Complex formed between 3 to 2 million years ago, it consists of basanite, tephrite and phonolite rocks.
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The Cenozoic platform ( which is also known as the " unconsolidated rock " level because the Cenozoic sedimentary rocks, due to their young age, have often not experienced intensive diagenesis and are therefore often not SiO 2-rich ) volcanic rocks of the transition level, the Cenozoic formations are mostly intermediate to very SiO 2-poor ( trachyte, basalt, phonolite, tephrite, nephelinite and basanite ).
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