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

Question

Quizplus · Accepted Answer

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

What Would You Name an Intermediate Coloured, Coarse Fragmental Volcanic