Question

There are __________ fundamental building blocks for the clay mineral structures.

(a) 3

(b) 5

(c) 4

(d) 2

I have been asked this question in an interview for job.

This intriguing question comes from Clay Minerals in portion Soil Structure and Clay Minerology of Geotechnical Engineering I

Answer 1

The correct choice is (d) 2

For explanation I would say: Silica tetrahedral unit and octahedral unit are the 2 building blocks of clay mineral.