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Pyrite with salt expulsion

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MEHo:
Hello,

Some years ago I bought a pyrite form Tsjechia. But now I got a problem: I think it is 'pushing out' salt and is crumbeling into dust very slowly. You can see that little white (salt) cristals are growing on the stone. But how could I stop it? Because I'm afraid that it wil rust when I put it in water for a couple of weeks. Does anywone have an idea?

Greetings, MeHo

Ralf:
Hi MeHo,

I´m sorry, but you have no chance to stop this process. May be you havn´t Pyrite but Marcasite. But anyway. The reason is a high sulphur. This will be decompose the Marcasite or Pyrite. This process is well known for Marcasite, may be it´s the same for Pyrite. I dont know.

Sorry
Ralf

MEHo:
Yes, you could be right. It gots some yellow spots on it. But I'm not sure it is Marcasite, because it has cubic looking cristals. Though it is a little grey. I'm afraid it will not take long, before it is dust  :(. But anyway, thank you for the information!

                                                                                                                    Greetings, MeHo

uwe:
Hello MeHo,

I know this process because  I subervised it at a specime from Ronneburg yeas ago, too. It was very interesting this quick generation of new minerals but at last it was a mixture of different unstable minerals.

I assume the white crystalls are alum. But be carefully. At this process  also acids are generated which may destroy something. Better you put the specime on a small ceramic or glass plate and whatch the process.

Best Regards
Uwe

wolfi:
Hi MeHo,
i think your pyrite is from Sokolov near Cheb. I had some of these in my collection, too. But meanwhile they are destroyed completely. The pyrites come from a brown coal quarry, i believe the coal is the reason for this desaster.
Servus + Glück auf
Wolfi

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