found: Academic Press dict. of sci. and tech., via WWW, Oct. 18, 2001(calcite (Mineralogy): CaCO₃, a colorless to white trigonal mineral of the calcite group that occurs in highly varied crystal forms, having a specific gravity of 2.71 and a hardness of 3 on the Mohs scale; as stalactites and stalagmites in caverns, in geodes, and as a petrifying material replacing fossil animal and plant remains; the chief ingredient of all limestones and marble, and one of the most widely distributed minerals in the world; trimorphous with aragonite and vaterite, and forms a series with rhodochrosite. Also, calcspar)