| 富碲马营矿[Ir（Te,Bi）2]——马营矿的新变种 |
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| 引用本文： | 於祖相.富碲马营矿[Ir（Te,Bi）2]——马营矿的新变种[J].矿物学报,1998,18(2):134-137,T001. |
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| 作者姓名： | 於祖相 |
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| 作者单位： | 中国地质科学院地质研究所!北京，100037 |
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| 基金项目： | 国家自然科学基金!99172082 |
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| 摘 要： | 富碲马营矿产在纯橄榄岩铬矿体中。在铝矿石及矿体附近的砂矿中均可找到。呈粒状自形结构，直径0．01～0．15mm。与硫铱矿（IrS2）、双峰矿、高台矿、马营矿及（Fe，Ni）9Cu3Ir6S20等紧密共生。有的呈脉状，宽0．1～0．2mm，长1．2mm。金属光泽。不透明，钢灰色，粉末黑色。HM＝3．7。VHN50＝161kg／mm2（范围132～215kg／mm2）。无解理。无断口。性脆。计算密度为12．2g／cm3。反射色亮白带淡黄色调，内反射无，均质性，双反射与反射多色性无。5个电子探针分析数据平均为（％）：Cu0．3，Te32．9，Ir34．7，Pt2．7，Bi28．2，总量98．9。实验式根据原子数3计算为：（Ir(0．92)Pt(0．92)Cu(0．01)）；(1．00)Bi(0．68)Te(1．31)。简化后的理论式为Ir（Te，Bi）2，而（Ir：Bi：Te＝3：2：4）。6条富碲马营矿是强X射线衍射hki、d、I为：210，2．89（60）；311，1．95（100）；511，1．246（70）；520，1．204（60）；440，1．145（60）；533，0．9891（60）。根据X射线粉晶指标化求得马营矿为等轴晶系，空间群：Pa3，a＝0．6486（4）um，V＝0．2729nm3，Z＝4。富碲马营矿是本文作者对马营矿研究的继续与补充。
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| 关 键 词： | 新变种 富碲马营矿 铬矿石 铬矿 橄榄岩 |
TELLUROMAYINGITE[Ir(Te,Bi)_2]-A NEW VARIETY OF MAYINGITE |
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| Yu Zuxiang.TELLUROMAYINGITE[Ir(Te,Bi)_2]-A NEW VARIETY OF MAYINGITE[J].Acta Mineralogica Sinica,1998,18(2):134-137,T001. |
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| Authors: | Yu Zuxiang |
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| Abstract: | The telluromayingite was found as a constituent of placer concentrates and crushed oresof the chromite deposit near the village of Maying about 230 km NNE of Beijing, China. Associat-ed minerals are: osmium, ferrian platinum ,iridisite, laurite, chromite, magnetite, gold, irarsite,shuangfengite, mayingite and (Fe, Ni)9Cu3Ir6S20. The minerals were formed hydrothermally andhave replaced iridisite and (Fe,Ni)9Cu3Ir6S20As massive aggregates measuring 0.01 - 0. 15mm in diameter and as veinlets measuring 0. 1 -0. 2mm wide and 1. 2mm long. Opaque with metallic lustre. Colour:steel black. Streak:black.H(M) 3. 7. VHN50 = 161kg/mm2 (range: 132-215). Cleavage: none. Fracture: none. Brittle- Den-sity could not be measured because of small grain size. Density(cal.) =12. 2g/cm3Colour: bright white with a yellowish tint. Internal reflection: none. Anisotropism: none.Bireflectance and pleochroism:none.Five chemical analyses were carried out by means of an electron microprobe using the follow-ing standards: pure metals: S, As, Cu, Te, Os, Ir, Pt, Bi and sperrylite(As). The analytical re-sults (and ranges ) are (% ):Cu O.3(0.1-0. 5),Te 32. 9(31. 8- 33. 8),Ir 34. 7(33. 5- 35. 6),Pt 2. 7(1. 9-3. 9),Bi 28. 2 (27. 2 - 29. 9), totaling 98. 8%- The empirical formula (based on 3atoms ) is: (Ir0.92Pt0.07Cu0.01)1.00Bi0.68Te1.31The simplified formula is Ir(Te, Bi)2,and (Ir: Bi: Te =3: 2: 4), which requires: Ir 38. 3, Bi 27. 8, Te 33. 9,totaling 100.00%.Single-crystal X-ray studies could not be carried out because of the small crystal size, but theX-ray powder diffraction data were indexed on a cubic cell (with systematic absences indicating thespace group Pa3). Six strongest lines hkl, d, I of the X-ray diffraction powder pattern are: 210,2. 89(60); 311, 1. 95(100); 511, 1. 246(70); 520, 1. 204(60);440, 1. 145(60);and 533, 0. 989 1 (60).Unit cell data (parameters refined from the powder data): cubic; Pa3, a - 0. 648 6(4)nm;V =0. 272 9nm3,Z = 4. |
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| Keywords: | new variety telluromayingite chromite deposit Hebei Province |
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