High-resolution radar observations by the Magellan probe by 1995 began to favor the hypothesis that metallic compounds sublimate in lower, warmer altitudes and deposit in higher, cooler areas. Candidates included tellurium, pyrite, and other metal sulfides.[2] More recent work has supported the mineral condensate scenario, and identified the “snow” as lead sulfide and bismuth sulfide precipitated from the atmosphere at altitudes above 2600 m.[4][5]