What would you name an intermediate coloured (35% dark minerals), phaneritic rock with large greenish- black amphibole phenocrysts?
A) porphyritic hornblende gabbro
B) hornblende diorite porphyry
C) porphyritic hornblende granite
D) hornblende andesite breccia

Question

Quizplus · Accepted Answer

The rock described is intermediate in composition (35% dark minerals) and phaneritic, indicating it is an intrusive igneous rock. The presence of large amphibole phenocrysts suggests a porphyritic texture. Diorite is the intermediate intrusive rock that fits this description, making "hornblende diorite porphyry" the correct choice.

What Would You Name an Intermediate Coloured (35% Dark Minerals)