Trachybasalt

An extrusive rock intermediate in composition between trachyte and basalt.
Found on http://midju.tripod.com/glossary.html

Trachybasalt

An extrusive rock intermediate in composition between trachyte and basalt.
Found on http://volcano.oregonstate.edu/education/glossary.html

Trachybasalt

Trachybasalt is a volcanic rock with a composition between trachyte and basalt. Minerals included in trachybasalt include alkali feldspar, calcic plagioclase, olivine, clinopyroxene and likely very small amounts of leucite or analcime. It contains high alkali content (5 to 7% Na2O + K2O, see TAS diagram). ...
Found on http://en.wikipedia.org/wiki/Trachybasalt
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