Igneous vs Trachyte - What's the difference?
igneous | trachyte |
Pertaining to, having the nature of fire; containing fire; resembling fire; as, an igneous appearance
(geology) Resulting from, or produced by, the action of great heat; with rocks, it could also mean formed from lava/magma; as, granite and basalt are igneous rocks
(geology, mineralogy) A pale igneous rock consisting mostly of potassium feldspar and plagioclase.
*2004 , (Richard Fortey), The Earth , Folio Society 2011, p. 52:
*:The type of rock that results is often described as trachyte and contains abundant crystals of a different kind of alkali-rich feldspar, such as sanidine, rather than plagioclase.