It's actually Ag (Silver)
Here's a list for all to reference:
Native Elements and Alloys: Copper* Cu (cub) Silver* Ag (cub) Gold* Au (cub) Mercury Hg (hex) Iron Fe (cub) Nickel-iron alloy (Ni, Fe) (cub) Platinum Pt (cub) Diamond C (cub) Graphite* C (hex) Sulfur* S (orth) Arsenic As (hex) Antimony Sb (hex) Bismuth* Bi (hex)
This is a large area they are referencing, not a bad result IMO.