目前在自然界中发现的金矿物不多，约20余种。最常见的为自然金、银金矿和金银矿，其次是碲金矿和碲金银矿等，虽种类较多，分布较广，但数量不多；至于金的铋经物、硒化物、锑化物和硫化物更为少见。
自然金极少是纯金，常含有不等量的银或其他元素。自然金一般呈不规则的粒状、片状、乳滴状、浑圆状、团块状、网状、纤维状、树枝状、海绵状集合体。按粒度大小分为巨粒金（>0.295毫米）、粗粒金（0.295～0.074毫米）、中粒金（0.074～0.037毫米）、细粒金（0.037～0.01毫米）、微粒金（<0.01毫米），一般砂金颗粒较粗大，脉金（岩金）粒度较小。
自然金有金属光泽，多呈金黄色，含银较高时呈淡黄色或乳黄色，硬度2～3，比重是15.6～18.2，纯金为19.3。野外鉴定自然金，主要根据金的顔色、金属光汗、硬度小用牙咬有痕印等特征来识别。
At present, there are not many gold deposits found in nature, about 20 species. The most common native gold and silver gold and silver ore, followed by the gold telluride deposits and petzite, although many kinds, wide distribution, but not much; as for the gold bismuth, selenium, antimony compounds and sulfide is more rare.
自然金极少是纯金，常含有不等量的银或其他元素。自然金一般呈不规则的粒状、片状、乳滴状、浑圆状、团块状、网状、纤维状、树枝状、海绵状集合体。按粒度大小分为巨粒金（>0.295毫米）、粗粒金（0.295～0.074毫米）、中粒金（0.074～0.037毫米）、细粒金（0.037～0.01毫米）、微粒金（<0.01毫米），一般砂金颗粒较粗大，脉金（岩金）粒度较小。
Very few natural gold is pure gold, often containing different amounts of silver or other elements. Native gold is generally irregular granular, flaky, emulsion, rounded shape, crumb, mesh, fibrous, dendrimers, cavernous assembly. For coarse-grained gold (>0.295 mm) and coarse gold (0.295 ~ 0.074 mm), gold particles (0.074 ~ 0.037 mm), fine gold (0.037 ~ 0.01 mm), gold particles (0.01 mm), general of placer gold particles and coarse, monarch (gold) smaller particle size according to the size of the particle size.
自然金有金属光泽，多呈金黄色，含银较高时呈淡黄色或乳黄色，硬度2～3，比重是15.6～18.2，纯金为19.3。野外鉴定自然金，主要根据金的顔色、金属光汗、硬度小用牙咬有痕印等特征来识别。
Natural gold metallic luster, a golden, silver containing high, pale yellow or creamy yellow, hardness 2 ~ 3, the proportion is 15.6 ~ 18.2, gold was 19.3. Natural gold, mainly according to the color of gold, metal light sweat, hardness of the teeth with a small bite marks and other features to identify.
