What would you name an intermediate coloured, coarse fragmental volcanic rock with large amphibole and plagioclase phenocrysts?
A) hornblende andesite breccia
B) porphyritic hornblende gabbro
C) hornblende diorite porphyry
D) hornblende granite porphyry

Question

Quizplus · Accepted Answer

Hornblende andesite breccia is the correct term because it describes a volcanic rock (breccia) that is intermediate in color, coarse, and contains large crystals (phenocrysts) of amphibole (hornblende) and plagioclase, which are characteristic of andesite composition.

What Would You Name an Intermediate Coloured, Coarse Fragmental Volcanic