text: Several hundred metals, compounds, alloys and ceramics possess the property of superconductivity at low temperatures. The SU(2) color quark matter adjoins the list of superconducting systems. Although it is a mathematical abstraction, its properties are believed to be closely related to the SU(3) 
  color quark matter, which exists in nature when ordinary matter is compressed at supranuclear densities above ~ 0.5 10 nucleon/cm.