Question

Which of the following rock forming minerals is more resistant to weathering compared to Hornblende?

(a) Augite

(b) Biotite

(c) Olivine

(d) Calcite

I had been asked this question by my college professor while I was bunking the class.

I would like to ask this question from Geological Work of Atmosphere topic in chapter Geological Work of Natural Resources of Engineering Geology

Answer 1

Correct option is (b) Biotite

The explanation is: The resistance to weathering increases in the following order for dark coloured minerals- Olivine, Augite, Hornblende, Biotite. Hence only Biotite is most resistant. Calcite as it is very reactive among the rock forming minerals.