碲锰铝矿在中国的首次发现  

KURANAKHITE DISCOVERED IN CHINA FOR THE FIRST TIME

作　　者：周新春 刘良[2] 王世忠 胡建民 炎金才[2] 杨建琨 

机构地区：[1]陕西长安县武警黄金十四支队,陕西长安县710100 [2]西北大学地质系,西安710069 [3]北京武警黄金指挥部,北京100012

出　　处：《矿物学报》1997年第2期115-119,共5页Acta Mineralogica Sinica

基　　金：武警黄金指挥部专项基金;陕西省教委科学基金

摘　　要：碲锰铁矿（Kuranakhite）最早是1975年发现于俄罗斯南雅库特金矿床氧化带之中，之后国内外均未见报导。本文所述碲锰铅矿发现于陕西省洛南县驾鹿金矿床中，常呈不规则粒状集合体，粒径一般为0．05～0．25nm，浅褐色至棕褐色，半透明，条痕棕色，玻璃光泽，维氏硬度HV=231～438kg／mm2，摩氏硬度HM=4～5。实测密度6．72（2）g／m3。反射色呈蓝灰至浅蓝色，非均性中等，双反射弱，偏光色蓝至灰棕色，无内反射。折射率N=2.01，NB=1．98，Nr=1．96。6个电子深外平均成分PbO为45.40％，MnO2为1641％，TeO3为38．10％，总和99．91％；计算的化学式为Pb0.99M0.92Te1.06O6，简写为PbMnTeO6。X射线粉晶分析主要强线d（I），（hkl）为：0．341（100），（111）；0.2556（60），（130）；0．2043（50），（041）；0．1666（20），（310）；0.1598（40），（241）；0.1472（15），（330）。根据粉晶指标化求得该矿物为斜方晶系，可能的空间群为C，a=0．511（1）um，b=0．891（2）nm，c=0．532（1）nm，a：b=0．57，c：b=0.60；V=0.242（3）nm3，Z=2，Dx=6.66（l）g／cm3。Kuranakhite has been discovered for the first time in the oxidized zone of southern Yakutgold mine, the former Soviet Union, and there has been no report on its form. Kuranakhite in thispaper was discovered in the Jialu gold mine, Luonan County, Shaanxi Province. The mineral oftenappears as an irregular granular aggregate measuring about 0. 05~ O. 25 mm in grain size. It islight brown to brown in color, translucent, brown in steak, and vitreous in luster. H. is 23l^438kg/mm2, H.～4~5 and measured density is 6. 72 (2) g/cm3. Its reflection color is bluish-grayto light blue. It shows proper anisotropism and low bireflectance. Its polarization color is blue tograyish-brown and there is no internal reflection. The index of refraction is: N.= 2. O1, NB= 1. 98,N. =1. 96. The average composition of six samples by microprobe analysis is PbO 45. 4O%, MnO2l6. 41 % and TeO3 38. 10%, totaling 99. 91 %. The calculated formula is Pb0.99,Mn0.92Te1.06,O6, whichcan be simplified as PbMnTeO6. The strongest lines in the X-ray powder pattern [d (l) (hkl) J are:0. 341 (l00), (l11); 0. 255 6 (60), (130) ; 0. 204 3 (50), (041); 0. 166 6 (20), (310) ; 0. 1598 (40), (24l) ; 0. 147 2 (15), (330). The kuranakhite is orthorhombic with space group may beC, a=O. 511 (1) nm, b=O. 89l (2) nm, c=O. 532 (1) nm, a: b=O. 57, c: b=O. 6O; V=O. 242(3) nm3, 2=2, and Dx=6. 66 (1) g/cm3.

关 键 词：碲锰铅矿 金矿床 陕西 共生矿物 氧化带 

分 类 号：P578[天文地球—矿物学]