Dark silicates have a specific gravity of 3.2 to 3.6 and are composed primarily of silica tetrahedral and____________ .
A) aluminum and sodium
B) iron and magnesium
C) aluminum and magnesium
D) potassium and iron
E) potassium and calcium

Question

Quizplus · Accepted Answer

Dark silicates are typically composed of iron and magnesium, along with silica tetrahedral. These elements give the silicates their characteristic dark color and high specific gravity.

Dark Silicates Have a Specific Gravity of 3