FMF - Friends of Minerals Forum, discussion and message board

[Cecil Bankston]

I purchased this specimen at a mineral show, where I had no references to confirm the ID. It does not appear to match the online descriptions and images of hisingerite that I have found. Mindat describes hisingerite as being black or brownish-black; but I see nothing of those colors on the specimen. Though the specimen is labeled as a pseudomorph, I would not think that would have anything to do with its color. If the ID is correct, I would like to know whether any more specific locality information is available.

[Peter Megaw]

Looks more complicated than a simple hisingerite replacement of ilvaite. Hisingerite normally looks like brown beer bottle glass and generally forms as an alteration of pyrite.

[John Betts]

Hisingerite pseudomorphs after ilvaite are well known from Dalnegorsk and are cited in Bernard and Hyrsl.

A similar specimen is online at dalerocks dot com but this bulletin board does not allow me to post the entire link.

[Peter Megaw]

The outer coating does not look likely to be hisingerite

You see the same hisingerite after ilvaite in the rhodochrosite-bearing calcic-iron skarns in the Main Silicate Body of the Potosi Mine at Santa Eulalia and probably Uchuchaqua as well...but not the whitish coating.

[Jordi Fabre]

The Hisingerite could be brown, like the recent ones from Huanggang described by Berthold Ottens in his recent article in the Record or like the yellowish-brownish ones from Broken Hill, Australia, so why not...?

[Jordi Fabre]

[Cecil Bankston]

[Cecil Bankston]