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Identity HelpPlatnium group ??

6th Aug 2010 01:31 UTCM.M.B A.M.B

01894680016029443727729.jpg
Hi every One Do you have idea ??







02636540016029443724162.jpg

6th Aug 2010 02:33 UTCPavel Kartashov Manager

Usual limonitized pyrite from my point of view.

6th Aug 2010 05:47 UTCRob Woodside 🌟 Manager

I agree.

6th Aug 2010 07:11 UTCJeremy Zolan

Pyrite. I'll also have to agree. Platinum shouldn't have any tarnish, especially a brownish one. It is extremely unreactive.

6th Aug 2010 08:55 UTCjacques jedwab

Following screening tests could be of some help:


http://www.ulb.ac.be/sciences/dste/volcano/JJ/testPt.pdf


There are also a few microchemical tests which are very effective and specific for Pt and Pd.


J.J.

6th Aug 2010 15:14 UTCM.M.B A.M.B

03867200016029443723511.jpg
There have chrome mine and also it is boiling in Hno3

Another pice
04451590016029443721492.jpg

06085110016029443729951.jpg

6th Aug 2010 16:08 UTCM.M.B A.M.B

07819110016029443726323.jpg
After The Nitric Acid They are saty in same

8th Aug 2010 13:12 UTCM.M.B A.M.B

08786730016029443728676.jpg
It is burn and wait 2 days Aqua regia



09951670016029443722409.jpg

8th Aug 2010 16:28 UTCReiner Mielke Expert

You need to isolate the crystals before using the acid or the acid will be neutralized by the matrix before it can have any significant effect on the crystals in question. Try a pure piece in concentrated nitric acid. If pyrite it will dissolve completely.

8th Aug 2010 23:55 UTCPavel Kartashov Manager

It is obvious not platinum group mineral - not native alloy of PGE, not intermetallide.

It is pyrite. And, by the way, matrix rock not similar to chromitite.
 
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