What is Mineralogy?

Mineralogy is the study of minerals. Minerals are natural chemical compounds in which atoms are arranged in very regular three-dimensional patterns. Minerals often occur in beautiful geometric shapes called crystals that reflect the internal patterns of a mineral’s molecular structure.
Minerals and combinations of minerals make rocks. Metals, gems, and industrial materials of many kinds derive from minerals and rocks. Study and appreciation of minerals is an important part of modern life.

Pyrite, Marion County IN

See Mineralogy on Wikipedia