Geocronite is a very rare, lead anitmony arsenic sulfosalt. There are several crystals in matrix, to about 1.2 cm across. This choice crystal has a complex, stepped habit with very good striations on some of the faces. The color is battleship grey, with a satiny luster. Likely a very old specimen (quite possibly mid-1800's), this species is not often seen in dealers stocks or even in museums. This is one of the better ones out there, on the market, I would think.