Crystals, minerals, rocks & fossils form over hundreds, thousands & millions of years, all being influenced by geological or meteorological environments. There are many different forms, colours & sizes, thousands of varieties exist in the current world. Each having its own unique chemical formula or geometric habit.

Minerals have had an enormous impact on all aspects of human evolution. from basic weaponry to fluorescent lighting, ancient colour pigments to stronger tools & faster cars. There is many exciting things to learn in the mineral world.

The fascinating wonders of crystals are endless!  

Recommend books for the scientific aspects of crystals.   
Recommended books for the metaphysical crystal knowledge.