Final answer:
The statement is false; 'lead' does not refer to silicate minerals but is a heavy metal with the symbol Pb, whereas silicates are primarily composed of silicon dioxide.
Step-by-step explanation:
The term 'lead' does not classify the six naturally occurring silicate minerals, so the correct answer to the student's question is b) False. Silicates are a group of minerals that make up approximately 90% of the Earth's crust and consist primarily of silicon dioxide (SiO2) based materials. These minerals have a wide range of compositions and structures, from single tetrahedra to complex frameworks. On the other hand, lead is a heavy metal with the chemical symbol Pb and is not a silicate mineral.