Personally I find this classification oddly specific, I mean do we really know what all meteorites are made of? Isn't this possible excluding the chance to lear

Personally I find this classification oddly specific, I mean do we really know what all meteorites are made of? Isn't this possible excluding the chance to learn more? Yes, the surface shd have been molten, but apart from that? Why not metal color? Isn't it believed that Guten Hammons dagger was made from meteorite iron?