Here is a trick to remember the names of the ores of iron:
Head Master got Sick of 5 Lemons from Iran
- Head - Hematite (Fe2O3)
- Master - Magnetite (Fe2O4)
- Sick - Siderite (FeCO3)
- Iran - Iron pyrite (FeS2)
- Lemon - Limonite (Fe2O3.3H2O)
Number 5 indicates there are total number of 5 items in the list.