Minerals that do not contain silicon are classified as:

A) nonsilicates
B) silicates
C) clays
D) mafic

Nonsilicates are minerals that do not contain silicon. Silicates, on the other hand, are minerals that do contain silicon. Clays can be a type of silicate or nonsilicate depending on their composition, and mafic refers to a type of rock or mineral that is rich in magnesium and iron, not necessarily lacking silicon.