沐川矿——一种新的含水的钼硫化物

MUCHUANITE, A NEW WATER-BEARING MOLYBDENUM SULPHIDE MINERAL

Muchuanite, a new water-bearing molybdenum sulphide mineral, was discovered in aseries of molybdenum-bearing feldspathic quartz-sandstone of the Jurassic system,Sichuan Province, China. Muchuanite is darkly powdery and very finely sealy with specific gravity=5.01(meas.) and 5.10(ealc.),and microhardness=16-35 kg/mm^3.Optically,it is nniaxial(-),Refrative index in sir Rs=26.6-29.5%,Rp=12.3-14.2%,colour index X=0.3114,Y=0.37848,λd=566mμ,Pe=14.4%.The chemical composition of muchuanite is given as follows;Mo 52.88,54.20;S 37.34 36.00;Fe n.d.,2.2;Si n.d.,0.5; H2O^+ 6.03,5.95;H2O^- 2.07,.00;total 98.59,99.85.Chemical and electron microprobe analyses gave the following formuls;MoS2,0.5H2O.Muchuanite is trigonal with space group C3^1=P3ml,unitcell parameters α=3.16A,c=43.60A,v=377.09A,z=7,and unit-cell containing 3.5 water molecules.The strongest lines given by X-ray diffraction pattern(d,A,intensity hkl)are 6.013(10,0.0.7);2.677(8.0.0.16);2.257(7,0.0.19);1.567(7,1.1.3);1.523(7,0.0.28);1.096(3,1.1.28);1.021(3,0.0.42).Muchuanite is syngenetic with feldspathic quartz sandstone.The mineral is named after the locality where it was discovered,i.e.Muchuan County in Sichuan Province.

Muchuanite, a new water-bearing molybdenum sulphide mineral, was discovered in a series of molybdenum-bearing feldspathic quartz-sandstone of the Jurassic system, Sichuan Province, China.Muchuanite is darkly powdery and very finely scaly with specific gravity=5.01 (meas.) and 5.10(calc.), and microhardness=16-35 kg/mm2 Optically, it is uniaxial (1). Refrative index in air Rg = 26.6-29.5%, Rp=l2,3-14.2%, colour index X= 0.3114, Y = 0.3748, λd = 566 mμ , Pe = 14.4%..The chemical composition of muchuanite is given as follows: Mo 52.88, 54.20; S 37.34, 36.00; Fe n.d., 2.2; Si n.d., 0.5; H20+ 6.03, 5.95; H3O- 2.07,1.00; total 98.59, 99.85. Chemi-cal and electron microprobe analyses gave the following formula: MoS2. 0.5 H2O.Muchuanite is trigonal with space group c13v =P3ml, unitcell parameters a=3.16 A, c=43.60 A, v=377.09 A, z=7, and unit-cell containing 3.5 water molecules.The strongest lines given by X-ray diffraction pattern (d, A, intensity hkl) are 6.013 (10,0. 0.7); 2.677(8, 0. 0.16); 2.257(7, 0. 0.19); 1.567(7, 1. 1.3); 1.523(7, 0. 0.28); 1.096 (3, 1. 1.28); 1.021(3,0.0.42).Muehuanite is syngenetic with feldspathic quartz sandstone. The mineral is named after the locality where it was discovered, i.e. Muehuan County in Sichuan Province.