Item talk:Q41811

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Mindat Short Description

Trachytic rocks, with felsics comprising 0-5% quartz and alkali feldspar/total feldspar 0.35-0.65. Also a potassic trachyandesite where Na^2O-2.

A porphyritic extrusive rock having phenocrysts of plagioclase and potassium feldspar in nearly equal am...

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