alkali feldspar trachytic rock
http://inspire.ec.europa.eu/codelist/LithologyValue/alkaliFeldsparTrachyticRock
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foid bearing alkali feldspar trachyte
Alkali feldspar trachytic rock that contains no quartz and between 0 and 10 percent feldspathoid mineral in the QAPF fraction. QAPF field 6'.
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quartz alkali feldspar trachyte
Alkali feldspar trachytic rock that contains and between 5 and 20 percent quartz mineral in the QAPF fraction. QAPF field 6*.
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alkali feldspar trachyte
Trachytoid that has a plagioclase to total feldspar ratio less than 0.1, between 0 and 5 percent quartz in the QAPF fraction, and no feldspathoid minerals. QAPF field 6.
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