@IceWolf that first one is barium ferrite, a hexaferrite that's used for stuff like magnetic strip cards and refrigerator magnets and cheap ceramic magnets
samarium cobalt is the first rare-earth magnet developed, a bit weaker than neodymium magnets but works at much higher temperatures
that messy alloy is one of a family called alnico, which are popular for guitar pickups
and the last one is your standard neodymium magnet
-F
@IceWolf magnets are neat
-F
@Felthry Neato!