1) Cubic mineral 2) Manganese mineral 
Hauerite is a manganese sulfide mineral with the chemical formula MnS2. It forms reddish brown or black octahedral crystals with the pyrite structure and it is usually found associated with the sulfides of other transition metals such as rambergite. It occurs in low temperature, sulfur rich environments associated with solfataras and salt deposits...
• (n.) Native sulphide of manganese a reddish brown or brownish black mineral.
Hau'er·ite (ha'ẽr*īt) noun [ Named after Von Hauer , of Vienna.] (Min.) Native sulphide of manganese, a reddish brown or brownish black mineral. 
Hauerite, named after Von Hauer, is a native sulphide of manganese, a reddish brown or brownish black mineral.
Manganese(IV) sulfide