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

Question

Quizplus · Accepted Answer

Dark silicates, also known as ferromagnesian or mafic silicates, are primarily composed of silica tetrahedral and iron and magnesium. This makes them denser than light silicates and gives them a dark color. Option B is incorrect as aluminum is usually found in light silicates. Options C, D, and E are also incorrect as they are not typically found in silicates.

Dark Silicates Have a Specific Gravity of 3