Which of the following would not true about rock-forming silicates?
A) Feldspars make up half of the Earth's crust and are divided into two groups, plagioclase feldspar and alkali feldspar
B) Quartz is pure silica and makes up 12% of crustal rocks
C) Quartz is common in continental rocks
D) Quartz is common in continental, oceanic rocks, and mantle material
E) Pyroxene makes up to 11% of the crust

Question

Quizplus · Accepted Answer

The statement "Quartz is common in continental, oceanic rocks, and mantle material" is not true. Quartz is not common in mantle material, as it is too rich in silica for the mantle's composition.

Which of the Following Would Not True About Rock-Forming Silicates