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Hematite will always be black. Those coloured ones are iron ceramics and porcelains.

Even unpolished hematite is always somewhat reflective. Especially if it has aluminium or nickel in it. A dull shimmer like looking at a brand new blackboard. Or over waxed linoleum.

Luis..im pretty sure all those things you named are ferrite which is fairly common...breaks with a hammer like cast iron...but even 5 pounds to an iron yard is nothing...i only found the "iron hematite" board with copper inside lcd moniters...along with that big green board with all the gold flashing..its very light though

thanks Phillypaul and lostinlods for the replays. i fugured that. well that bucket full of ferrite inductors i`m thinking in crush in my rock crusher toget the copper out and dump the rest with mixed metals. At least copper stil the best value in no ferrous common metals. So lets keep removing those big inductors that downgrade boards. Regards....

hematite

ferrite

Both are "organic" ceramics in that they are naturally occurring.
Those are the two most common non-adulterated ceramics in electronics.
Also used is both compressed iron powder and compressed aluminium powder. As well as aluminium magnecite.
Next and far more common on modern are crafted ceramics which are made of various sands and iron. Depending on use copper nickel gold or magnesium may also be added in these.
Finally iron glass is used in many micro portables. Which is just iron oxide and silicates.

Many of your green power boards like these will fetch mid grade at the most. In several cases, you would make more stripping the transformers with exposed copper wire and breaking them apart for the copper. Look up Moose Scrapper on youtube to find a video he created on scrapping transformers for easy copper.

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kgryczan
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