天然的水晶一般都会有絮状（绵绺），也就是大家俗称的瑕疵，这是液体水落石出和二氧化碳的小孔穴，而人工合成的水晶就不会有这样的特征。Bismuth (Bi) seems to be a steel, but the volume of electrons readily available for electrical conduction is comparable to that of semiconductors. In reality,