Metal particles in the coolant

[amroismail]

Hello everyone,
I know it sounds weird but I just bought a used 2008 X5 4.8L
and I found a coolant leakage from the reservoir hose, while going through fixing that I took out the reservoir and I found some white sludges in there which I also cleaned out. but the weird thing is I put the liquid in a bottle and I found some kind of metal particles in it. this is new for me because normally you could find that in the oil and it is wearing a sign, but does anyone know what it means to be found in the coolant? the engine is healthy and running well with 190 K kilometers on it.

i took what is left down from the liquid on a plate and you can see the shining metal in there

cheers