Answer:
The great varieties of minerals on the Earth are classified by mineralogists into a small number of groups on the basis of : The negative ion or ionic group in their chemical composition.
Explanation:
Minerals are classified based on their chemical properties. The anion, a negatively charged ion that generally comes at the end of a mineral's chemical formula, is the fundamental foundation for classifying minerals, with the exception of the native element class. Cations are ions with a net positive charge because they have fewer electrons than protons. Anions, on the other hand, have a net negative charge because they contain more electrons than protons.
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A graph that shows the relationship of a star's temperature to its absolute magnitude is called HERTZSPRUNG - RUSSEL DIAGRAM.
Hertzsprung Russel diagram is a scatter plot that is typically used to show the relationship between star absolute magnitude and their effective temperatures. The absolute magnitude of a star refers to how a bright a star will appear if it is located 32.6 light years from the earth.
Astronomers use Hertzsprung Russel diagram to classify stars into different classes based on their colour, spectral, temperature and evolutionary stage.
