Answer:
When teaching about igneous rocks, one trick instructors often implement to help students determine the igneous composition of the samples is to use the color of the rocks as a guide.
The color is a strong indicator to determine the composition of igneous rocks and its chemical composition. The light color indicates the presence of Felsic components which are rich in Silica.
Whereas the dark color indicates the presence of Mafic composition which is comparatively poor in Silica. Yet they are rich in Iron and Magnesium. This method of identifying the Igneous composition is called Color Index.
" Felsic Composition is a material which has silicate minerals and is rich in lighter elements such as silicon, oxygen, aluminium, sodium and potassium."
" Silica is a group of minerals which is composed of both silicon and oxygen."
" Mafic Composition is a mineral rock that is rich in Magnesium and Iron."
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