Argentian mercurian gold, golden-yellow in colour, is a variety of native gold containing Ag and Hg, occurring as hexagonal and tetragonal crystals in hairy, milk-droplet or irregular forms. Its microhardness Hv=91kg/mm², equivalent to 3.04 on Mons’ scale, and the reflectance is 70. 35% (589nm). Chemical analysis gave: Au 56.05-67.33, Ag 18.29-31.06 and Hg 10–14.82%, as well as minor Cu. In a few samples Bi or Fe was also detected. The simplified formula is (Au_0.52 Ag_0.36Hg_0.09Cu_0.02)_0.99. X-ray analysis suggests the mineral is of isometric system, with space group =O _h ⁵ -Fmlm, a ₀=0.40803 nm,V=0.06739nm₃, andZ=4.