What would you name a light pink, aphanitic, fragmental pyroclastic with sparse quartz phenocrysts?
A)rhyolite tuff
B)quartz porphyry
C)andesite breccia
D)porphyritic granite

Question

Quizplus · Accepted Answer

Aphanitic refers to a fine-grained texture, and fragmental pyroclastic suggests that it is formed from volcanic ash and debris. The sparse quartz phenocrysts distinguish it from a typical rhyolite tuff, which would have more abundant quartz phenocrysts. Andesite breccia also wouldn't be appropriate, as andesite typically has darker colored minerals than the light pink described. Porphyritic granite has a different composition and texture than what is described. Therefore, rhyolite tuff would be the best choice for this type of rock.

What Would You Name a Light Pink, Aphanitic, Fragmental Pyroclastic