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在光片中鉴定金,根据金的反射率及反射色特征,低硬度,常有擦痕等,不难与其他矿物区别.但有一种外来混入物易于与金混淆,造成干扰.这种物质即含铜铝合金,它来自抛光机的金丝绒固定环和防护边圈.含铜铝合金与自然金类矿物混淆的原因是:1.含铜铝合金的反射率高,在光片中常为微带黄色的白亮颗粒.λ_(475)的反射率为66.43～76.43%;而同一波长的银金矿的反射率为57.15%,金银矿为71.00%,自然银为84.34%;含铜铝合金的反射率正好落在银金矿到自然银的范围内.
The identification of gold in light sheet, according to the reflectivity of gold and reflective color characteristics, low hardness, often scratches, etc., is not difficult to distinguish with other minerals, but there is a foreign mixture easily confused with gold, causing interference. That is, copper-containing aluminum alloy, which comes from the polishing machine gold velvet fixed ring and the protective edge of the copper-aluminum alloy and natural gold mineral confusion reason is: 1. Copper-containing aluminum alloy reflectivity, in the light film is often The reflectivity of λ_ (475) was 66.43 ~ 76.43%, while the reflectivity of silver and gold mine with the same wavelength was 57.15%, that of gold and silver mine was 71.00% and that of natural silver was 84.34% The reflectivity of the alloy falls just within the range of silver and silver to natural silver.