Of the five rock-forming mineral groups-the silicates,carbonates,oxides,sulfides,and sulfates-which two form economically important ores?
A)silicates and carbonates
B)carbonates and oxides
C)oxides and sulfides
D)sulfides and sulfates

Question

Quizplus · Accepted Answer

Economically important ores are typically formed from metallic elements, and the only two mineral groups that commonly contain metallic elements are the oxides and sulfides. While some sulfates, such as gypsum, are economically important in certain industries, they are not typically mined for their metallic content. Silicates and carbonates are both very common in rocks, but do not generally contain metallic elements in concentrations sufficient for economic extraction.

Of the Five Rock-Forming Mineral Groups-The Silicates,carbonates,oxides,sulfides,and Sulfates-Which Two Form