Which one of the following sets is not correctly matched?

• A

  Cuprite, haematite - oxide ores
• B

  Calamine, siderite - carbonate ores
• Correct answer
  C

  Magnetite, malachite - silicate ores
• D

  Sphalerite, fool's gold - sulphide ores

Hence, the correct answer is option: 'C'.