In feldspars, what element can be thought of as substituting for silicon in the tetrahedral ionic sites?
A)carbon
B)aluminum
C)sodium
D)potassium

Question

Quizplus · Accepted Answer

Aluminum has a similar ionic radius as silicon and can easily substitute for silicon in the tetrahedral ionic sites of feldspar. This substitution is known as aluminosilicate substitution and is commonly observed in many minerals.

In Feldspars, What Element Can Be Thought of as Substituting