Dims: 0.83x0.47x0.43" (2.1x1.2x1.1cm)
Wt: 25.8ct (5.16g)
San Juan de las Rayas Mine, Guananjuato, Mexico
This is a pseudomorph of acanthite after argentite. The argentite crystal shapes were distorted in the conversion, as is often the case. The form is that of a stem with several blocky crystals attached. The acanthite appears grayish-black and metallic, with its luster dull in most places from a brown tarnish.