The research on the origin and locality of jade is one of the most important items in the study of gemology and jade archaeology, and a basic method for study is to comprehend the detailed characteristics of jades from different producing localities. Based on the conventional gem constants and the analysis using such means as X-ray diffraction, scanning electron microscopy, electron microprobe analysis, and laser ablation plasma mass spectrometer (LA-ICPMS), this paper reports for the first time the gemological characteristics of a new nephrite material from a new locality of Guizhou Province in China. With mainly the porcelain white-gray color and micro-leaf-like crisscross and microporphyroblastic fiber-crossed structures, The transparency of this material is a little lower than that of common nephrites. The other data, such as the Mohs hardness scale of about 5.8, the refractive indexes of 1.600～1.608, the S.G of 2.88 and the compressive strength of 357.4～446.75 MPa, are slightly below the standard data of nephrite. The results show that the mineral components of the new nephrite type are mainly tremolite, with subordinate diopside, calcite, albite (?) and quartz mineral inclusions. The crystal chemical formula of tremolite is (Cr_0.02Al_0.03 Fe_0.03 Mg_4.94)(Cr_0.02 Na_0.023 K_0.01Ca_1.98) (Si_4.246 O₁₁)₂ (OH)₂. As for major elements, silicon is rich, but there exists no titanium. The content of rare earth elements is high, with obvious HREE and LREE differentiation. La_N/Yb_N ratios vary from 30 to 60. There exists depletion of HREE, with negative Eu, Ce anomalies. The REE distribution pattern is of relatively steep rightly-oblique type. In comparison with the nephrites found in other areas, the authors hold that the nephrite material studied in this paper is unique and seems to be a new nephrite jade material.