Mafic materials are usually dark in color and have relatively high specific gravities grater than 3.0 Felsic materials are usual at lighter in color and have specific gravities less than 3.0
The mafic minerals are silicates or rocks rich in magnesium and iron, they are dark in color. On the other hand, the felic minerals are rocks and magmas rich in light elements such as silicon, oxygen, aluminum, sodium and potassium, they are normally light in color.
