新的金矿物——珲春矿(Au_2Pb)

A NEW GOLD MINERAL——HUNCHUNITE (Au_2Pb)

珲春矿产于吉林东部珲春河第四系冲积砂金矿中,矿物粒度十分细小,常与自然金或阿纽依矿(AuPb_2)呈文象交生。在光学显微镜下新鲜面为灰白色,金属光泽,氧化后颜色变暗。等轴晶系,Fd3m空间群,显微硬度128～149kg/mm^2。化学成分:Au 63.38％～66.26％,Pb 31.60％～24.64％,Ag 1.76％～2.96％。矿物化学式为Au_2Pb。

Hunchunite was found in gold concentrates from Quaternary alluvial gold placers along the Hunchun River, East Jilin. It is fine in size and always intergrows with native gold or anyuiite. The mineral is opaque with metallic luster and silver-grey in color. When oxidized in 1.5～2 days, it will become dull grey. Cubic system, space group Fd3m, unit cell parameter α=0.7933nm, density(calc.)15.99 g/cm^3, Hv(load 5g) 128～149 kg/mm^2, chemical composition: Au 63.38%～66.26% and Pb 31.60%～34.64%, mineral formula Au_2Pb.