nonferromagnesian silicates

Which Of The Following Correctly Describes The Difference Between Ferromagnesian And Nonferromagnesian Silicates? Which of the following correctly describes the difference between ferromagnesian and nonferromagnesian silicates? Nonferromagnesian silicates are lighter in color and do not contain iron or magnesium. A cubic centimeter of quartz, olivine, and gold weigh 2.5, 3.0, and 19.8 grams respectively. What