I think the best-kept secret in the rock world is mineral specimens.
The average person has probably never seen, and probably isn’t even aware of, the hundreds of beautiful, brightly colored, completely natural minerals for sale to collectors all over the world-sometimes for thousands or even hundreds of thousands of dollars!
Scientifically a mineral is a naturally occurring solid, formed through geological processes, that has a specific chemical composition, a highly ordered atomic structure, and definite physical properties, which is often expressed in the typical outward growth of crystals.
According to the International Mineralogical Association, the organization founded in 1958 who is responsible for tracking and naming new mineral specimens, there are currently more than 4,000 known minerals. Only about 150 can be considered common or at least available, and the rest are rare.
For more information see our Mineral Specimen page.