Lollingite, which is composed of Iron Arsenide is classified as a sulphide. It is an uncommon mineral that is a silver white color when freshly exposed, but this darkens considerably when tarnished. It is associated with several other arsenides, especially arsenopyrite, as well as calcite, siderite, sodalite, pyrrholite, chalcopyrite, and others. Although it is a rare mineral, it is found in a number of different localities — these include Austria, Germany, Brazil, Norway, Sweden, Finland, Poland, and the USA. Lollingite has a specific gravity of between 7.1 and 7. 5, a metallic luster, and a gray-black streak.