The Siglo XX mine is probably best known for it's phosphate species, but there are some very attractive Pyrite specimens that come out from time to time. This piece is a rather aesthetic piece featuring several relatively sharp, lustrous, slightly modified cubic crystals of Pyrite forming a somewhat spherical-shaped specimen. This piece is essentially a "floater" as I cannot find any true point of attachment. This specimen is from a find made in March of 2005.