quartz, mica, or gypsum. Minerals are most commonly found as components of rocks, which are mixture of minerals, but are often found by themselves in more or less pure form.
The molecules of a mineral usually are arranged in a regular pattern, and may grow in a regular, visible, crystalline structure. When they do, they are often beautiful in appearance.
11 Major Mineral Classes
- Phosphates, Chromates, Arsenates, Vanadates
- Tungstates and Molybdates
- Silicates 
- Sinkankas, John; Mineralogy for Amateurs, Van Nostrand Reinhold Company, 1964, page 49