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由于Fe~(2+)是浅绿色的,所以亚铁盐大多数呈绿色系列,比如:Fe(CO)_3灰色、FeF_2·8H_2O绿色、Fe((NO)_3)_2·6H_2O绿色结晶、Fe(SO)_4·4H_2O绿色结晶等等。对于Fe(OH)_2,晶型沉淀也为浅绿色,只在无定形时为白色。无定形沉淀是由许多疏松聚集在一起的微小沉淀颗粒组成,颗粒的排列杂乱无章,颗粒的直径小于0.02μm。按照现代沉淀理论,决定最初沉淀性
Since Fe~(2+) is light green, most of the ferrous salts are in green series, such as: Fe(CO)_3 gray, FeF_2·8H_2O green, Fe((NO)_3)_2·6H_2O green crystal, Fe (SO)_4·4H_2O green crystal and so on. For Fe(OH)2, the crystalline precipitate is also light green and is only white when amorphous. Amorphous precipitates are composed of a number of loosely-agglomerated, tiny, precipitated particles. The arrangement of the particles is disorganized and the diameter of the particles is less than 0.02 μm. According to the modern sedimentation theory, the initial precipitation was determined