Here's why:
* Andesite is an intermediate extrusive igneous rock with a composition between basalt (mafic) and rhyolite (felsic). It's typically characterized by a medium-gray color and contains phenocrysts of plagioclase feldspar and hornblende.
* Dacite is an intermediate extrusive igneous rock, very similar in composition to andesite. It has a slightly higher silica content than andesite, but the overall mineral composition is quite similar.
While both are extrusive, their texture can differ. Andesite often has a fine-grained texture, while dacite may have a porphyritic texture with larger crystals (phenocrysts) embedded in a finer-grained matrix.
