Which two mineral grains would most likely be found in soil formed from granite?

Question

A- Olivine and Pyroxene
B- Potassium feldspar and Quartz
C- Plagioclase and Pyroxene
D-Olivine and Nepheline
Please say why you picked the answer.

Answer 1

I'll agree with the first answer, its reasoning and add...

Feldspar is usually the first mineral to breakdown in granite and will eventually turn into clay.

Quartz which is harder and more resistant to weathering usually separates into crystals and then the crystals get rounded by weathering into sand-like grains.

Answer 2

Answer is: B

Granite: Its major constituent is potassium feldspar. The gray, clear mineral is quartz, which is diagnostic of granite—that is, a rock without quartz, no matter what else is in it, cannot be called granite...