Tag Archives: stibarsen

Stibarsen and Erlichmanite

Last week I received from Dakota Matrix a specimen each of Stibarsen and Erlichmanite.   I had been aware of Stibarsen for some time, it is one of the two applicable Arsenic Antimony alloys.  This is a welcome addition to my Arsenic Suite which otherwise contains mostly sulphide variants.  This piece exhibits the massive habit of the species rather than those nice botryoidal aggregations I have seen; it hails from The Harz in Germany…

AsB1/2.01 Stibarsen
Photo by Dakota Matrix

AsB1/2.01 Stibarsen
Photo by Dakota Matrix

I was really surprised to come across the Erlichmanite for sale – I bought it instantly.  I never thought I’d ever get a hold of the only sulphide of Osmium, and this specimen is really tiny.  In my Osmium Suite there are only two applicable species, Osmium (which is essentially an alloy of Iridium and Osmium) and Erlichmanite which is OsS2, something of the Osmium analogue of Pyrite…  This specimen, from Goodnews Bay in Alaska, is a cut and polished section of Platinum containing the Erlichmanite, mounted in a disc of  epoxy.  The identification has been confirmed through EDS, energy dispersive spectroscopy.  Also included with the specimen are several backscatter images from the EDS showing the Erlichmanite in pink/red.  With this addition of Erlichmanite my Osmium Suite is now complete, as I had purchased an example of Osmium earlier this year.

Os2.01 Erlichmanite
Photo by Dakota Matrix

Os2.01 Erlichmanite
Photo by Dakota Matrix

Os2.01 Erlichmanite – EDS backscatter image
Photo by Dakota Matrix

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