The mineralogical study of` the rhodonte from a certain gold deposit lo- Gated in Suichang of Zhejiang province, China, including the chemical, compo- sition, crystal structure and physical propeaties of rhodonite, is relevant to the: genesis information on the deposit type and: the conditions of its genesis，and is of typomorphic significance. The-systematic data, which include the genetal geology of the 'gold deposit, the chemical e4mposition (the main composition), crystal structure (diffraction of X-ray and unit cell extent)，and some physi- cal properties (such as refractive index, reflectance, microhasdness, specific gravity, differential thermal analysis, thermal luminescence and infrared spec- tra) of the rhodonite, are given in this paper. The problems of the typomor- phic peculiarities of rhodonite and the genesis of a certain gold deposit in Suichang are discussed. On basis of the mineralogical study, the author holds that the typomorphic peculiarities of the rhodonite would be of some help to the research into the "subvolcanic rocks" genesis of the gold deposit. As a re- suit of the study of minexaIogy of rhodonite, it has provided mineralogical marks for surveying and prospecting of volcanic hydrothermal gold deposits. These mineralogical marks indicate the following typomorphic peculiariti- es of rhodonite. Rhodonite from a certain gold deposit in Suichang, Zhejiang has the chemical formula (Mn0..080 Ca0.330 Mgo.127 Fe0.019)4.556 Si5.222 O15.000. Lattice unit cell extent a:b:c=0.627:1:0.572. Refractive index Ng is 1.7395士0.0065, Nm is 1.7280士0.0050 and Np is1.72I0士0.0010. Reflectance R546= 0.076士 0.001. Mierohardness Hv is 489.5 士 30. 5kg/mm2. Specif is gravity D= 3.675士0.055. DTA curve has a endothermal valley near 1214℃ or 1114℃ and a small valley in the vicinity of 1189℃ or 1165℃, New mineralogica.I masks for suave如ng and prospecting of volcanic hydrothermal gold deposits are thermal luminescence and infrared spectxa of rhodonite, Gold bearing rhodo- nice has strong thermal luminescence and the thermoluminesoence curve has a distinct peak. The major infrared spectra. absorbefficient peaks move 2-11 cm-1 toward the short wave direction.