黑龙江三道湾子金矿一种新的结晶质Au-Te化合物

A new crystalline compounds of Au-Te in Sandaowanzi gold deposit,Heilongjiang Province

化合物Au2Te产于黑龙江省三道湾子金矿含金石英脉的碲化物脉中,呈球状(20~35μm)分布在碲金银矿裂隙中,由碲金矿"外皮"(2.5μm)包裹。Au2Te球体可独立存在也可为多个球体由"外皮"的碲金矿细脉相连呈串珠状,其内部有时见有团粒状或不规则状自然金。该物质在反光镜下具弱非均质性,与相邻矿物界线清楚。探针测得该化合物化学成分稳定,计算化学式为(Au0.85Ag0.1)2Te1.00^(Au0.95Ag0.09)2Te1.00,简化化学式为Au2Te。据XRD分析结果,其强峰为2.3510、2.0730、2.9316、3.0191,与数据库对比无此类矿物。认为Au2Te是一种新的Au-Te晶质体的化合物,很有可能是一种新矿物,是碲金矿和自然金2种矿物反应的产物。

Compound Au2Te was found in auriferous quartz vein in Sandaowanzi gold deposit,Heilongjiang Province.The compound is round sphere（20～35μm）,surrounded by calaverite ＂wrapper＂（2.5μm） in the fracture of petzite.The round sphere sometimes exists independently,and sometimes several Au2Te spheres are linked together by calaverite fine vein from ＂wrapper＂.The compound has weak anisotropy according to the observation under the reflecting microscope and boundary with surrounding minerals is clear.Within the sphere there may be smaller gold.The chemical composition range of the compound is（Au0.85Ag0.1）2Te1.00-（Au0.95Ag0.09）2Te1.00,the simplified is Au2Te,and its composition is stable.According to the results of XRD,the strong peaks are 2.3510,2.0730,2.9316,3.0191,and there are no such minerals by comparing with the data base.Therefore,Au2Te is a new Au-Te crystalline compound,probable a new kind of mineral.Au2Te derives likely from reaction of Au2Te and native gold.