Minerals, Collecting, and Value across the US-Mexico Border
At first glance, it may seem that the value of specimens of opal, silver, or amethyst is related to their intrinsic qualities. After all, minerals ostensibly represent bits…
At first glance, it may seem that the value of specimens of opal, silver, or amethyst is related to their intrinsic qualities. After all, minerals ostensibly represent bits…