But it is less often considered how radically different the two substances are: the former is soft, the latter hard; the former is black, the latter crystalline and translucent; the former conducts electricity, the latter insulates (at normal pressures).
再以眾所周知的石墨（碳）為例，石墨在高壓下會變成鑽石，但石墨和鑽石具有完全不同的特性：石墨軟、鑽石硬；石墨黑、鑽石晶瑩剔透；石墨導電、鑽石絕緣。