From Archaeology Magazine, World Roundup, May/June 2013 Magazine. (Goddesschess' Random Round-up was a popular feature put together 2, 3 and sometimes even 4 times a month by Don McLean, may he rest in peace, that he worked on tirelessly from April, 2007 until May/June, 2012. Don passed away unexpectedly on October 12, 2012. He was particularly interested in shamanism throughout the world, seeing a common link among all cultures that exhibited shamanistic practices.)
PANAMA: A rock collection represents the earliest known evidence for shamanistic practices in lower Central America. Between 4,000 and 4,800 years old, the group of 12 small pieces of crystal and other stones were found in the back of a rock shelter. Several show abrasions and other signs of use, and all were found in a tight pile, indicating they may once have been in a bag or basket. The belief system behind the cache is not known, but nearby modern indigenous groups also use unusual stones in rituals. —Samir S. Patel
I think this may be a brief report on this story that was reported in January, 2013 at The Huffington Post/Science (yes, The Huffington Post. They post some amazing articles):
Shaman Stones Found In Panama Include Magnetic Rocks, Crystals
Here's a photograph of the collection of 12 stones I posted back then: