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Techniques for Collectorsmagnetic response in platinum minerals

11th Jul 2011 14:07 UTCAnonymous User

Following up on the recent thread on gemstone magnetism.....

I have a typical cubic crystal of platinum from Konder. It shows pretty strong magnetic response (it is 1g, and is picked up by the RE magnet).

What, if anything, does this indicate? Platinum, but with a certain Fe content? Isoferroplatinum? I don't have any others to test in comparison. I'd like to run one of these magnets through a batch of Pt crystals and see what shakes out. Has anyone tried this with Konder Pt?

Thanks.

k

11th Jul 2011 14:31 UTCRalph S Bottrill 🌟 Manager

Most platinum contains some iron in solid solution, which would make it variably magnetic; if it has enough iron, it could be isoferroplatinum ot tetraferroplatinum.

11th Jul 2011 17:05 UTCAlfredo Petrov Manager

Ken, I've never seen platinum without alloyed iron, if it is from a magmatic source. So all Konder platinum crystals should be somewhat magnetic. If you have one that does not react at all to a magnet, then it needs checking more carefully - might not be platinum at all but rather zvyagintsevite or some other species.

11th Jul 2011 17:54 UTCKirk Feral

Platinum is strongly paramagnetic by itself. It is one of the paramagnetic transition metals. Iron is another. As you see in my website gemstonemagnetism.com, gems in Platinum jewelry cannot be tested with a magnet, but gems in Gold and Silver jewelry can, as Gold and Silver show no paramagnetic response.

11th Jul 2011 18:01 UTCAnonymous User

Kirk:

As you may have seen in the thread about your website, I have enjoyed testing some of my own extensive gem collection, and may have new observations to add. Great website, and great addition to gem testing! Thanks!

19th Sep 2011 13:51 UTCBart Cannon

As per usual, the mineralogical nomenclature has been revised.

My recollection is probably already out of date, but I think Cabri has dispensed with "isoferroplatinum" in favor of ferrian platinum.

It is of some interest that the old isoferroplatinum usually contained 9% iron. That suggests more than a variable alloy.

It is of great interest to know that placer miners throw out the magnetic fraction of their concentrates.

In places like the Tulameen in South Central British Columbia, that can constitute a considerable loss since ferrian platinum is almost as common as the placer gold there and quite magnetic..

According to my personal theory, the headwater of the ancient Skagit River here in Washington State was once the ancient Similkameen River whose headwaters are the Tulameen.

I have found Tulameen characteristic placer PGM, including tulameenite (PtCuFe) in every western Washington river. In fact, these PGM are actually found all the way out on the coastal beaches of the Olympic Peninsula far West of Seattle.

I haven't checked in Cabri's latest publication to see if tulameenite is still a valid species.

8th Jun 2014 01:40 UTCKen M

Platinum is Paramagnetic but NOT Magnetic like iron and nickel meaning it's affected by a magnet but not attracted to the magnet,Aluminum is also Paramagnetic but you need a powerful magnet ot field to feel this effect.,

Ken M.

8th Jun 2014 01:57 UTCKen M

BTW, no amount of Iron will make Platinum magnetic foe example stainless steel.

Stainless steels contain in varying amounts of Iron but about 75% and it is non magnetic,

nickel and chromium s the balance the later give SS it's "stainless" quality.

Their are exceptions beyond the scope of this forum.

8th Jun 2014 02:11 UTCRob Woodside 🌟 Manager

Why do Pt grains containing Fe stick to a magnet?

8th Jun 2014 14:01 UTCAlfredo Petrov Manager

Ken, we're talking about the mineral platinum here, rather than the pure industrial metal. The mineral platinum is certainly attracted to a magnet, with few exceptions.

26th Oct 2014 10:05 UTCEnzo

hi' i am just inquiring about old steel iron's that are on fire or coal stoves...my question is could there be a possibility of platinum on it...besides the stainless steel ones...if theres a chance of such are they sold?

7th Oct 2016 18:00 UTCarod platnium

I have found over 3 ounces of platinium in last week here in oregon. I use marine magnets and to pull out the black sands but also pulls the platinum.

8th Oct 2016 11:36 UTCPavel Kartashov Manager

Any natural platinum of magmatic origin is iron- and nickel-bearing. So it always attracted to strong neodymium magnet. When you use more weak magnets you may to feel difference between varieties of ferroplatinum.

According to my expirience, ability to attract to magnet grows in the row isoferroplatinum < polyxene < tulameenite < tetraferroplatinum/nickelferroplatinum.

But in any case magnetite is much more strong magnetic in comparison with tetraferroplatinum. So if you have enough weak magnet you may to attract only magnetite without touching of ferroplatinum grains. If you haven't enough weak magnet, you may to use nonmagnetic buffer hoods over your magnet.

Besides that, if you wash in Oregon, you may to catch a lot of awaruite http://www.mindat.org/min-439.html together with ferroplatinum. Awaruite is very strong magnetic, and you will be unable to divide it from magnetite by any magnet (even equipped with hoods). But you may to eliminate awaruite from your PGM concentrate by dissolution - boiling in concentrated nitric acid. Awaruite is soluble in difference from ferroplatinum.

Iron-free native platinum of hydrothermal-metasomatic origin (or obtained by burning of sperrylite) is not magnetic (don't attracts to neodymium magnet).

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