Tag Archives: antimony

Evenkite, Uzonite, Otavite, Clinocervantite, and Phosgenite

My first minerals for 2013 are additions to my Carbon, Arsenic, Cadmium, Antimony, and Lead suites.  From Dakota Matrix I purchased Evenkite and Uzonite.  The Evenkite is an organic hydrocarbon, C21H44, and this example is the type locality hailing from the Evenki District in Siberia, Russia.  Appearing as several tiny white waxy flakes it’s rather unremarkable looking, but the chemistry is interesting.  The Uzonite is one of eight pure arsenic sulphides applicable for my collection, which of course also includes Realgar, Orpiment, and Pararealgar.  This is another type locality specimen being from the Uzon caldera in the Kamchatka peninsula, Russia.  This specimen is a small 3mm nugget covered in the yellowish powdery crust of Uzonite, with some organge Alacránite present.

I purchased specimens for the first time from www.yourmineralcollection.com, a website operated by Giuseppe Siccardi.  The website has a Systematic Shop section: “rare minerals for demanding systematic collectors”, so naturally I was intrigued…  The website style is very basic and the photography is not as polished as I’ve seen on other sites, but I did find a number treasures seldom seen for sale.  Giuseppe shipped my order expediently without delay, even over the holiday season, and it was really well packaged for protection during transit.  I will definitely continue to look for further purchases from Giuseppe’s site.

I had never seen Clinocervantite for sale before, so I was keen to add another applicable antimony oxide into my collection.  With examples of Cervantite and Valentinite I now only need to obtain some Sénarmontite to have the antimony oxides completely represented.  The Clinocervantite crystals appear as tiny colourless needles in small vugs throughout an antimony rich matrix.  This example is from the Tafone Mine, Grosseto Province in Tuscany, Italy.

Sb4.4/4.01  ClinocervantitePhoto by Giuseppe Siccardi

Sb4.4/4.01 Clinocervantite
Photo by Giuseppe Siccardi

Sb4.4/4.01  ClinocervantitePhoto by Giuseppe Siccardi

Sb4.4/4.01 Clinocervantite
Photo by Giuseppe Siccardi

From Giuseppe I also ordered an example of Otavite, a very rare cadmium carbonate that I almost never see for sale.  This specimen is also from Italy, uncovered from the Su Elzu Mine in the  Sassari Province, Sardinia.  The Otavite crystals are  miniscule white blocky crystals tucked away in a tiny vug.

Cd5.01  OtavitePhoto by Giuseppe Siccardi

Cd5.01 Otavite
Photo by Giuseppe Siccardi

Cd5.01  OtavitePhoto by Giuseppe Siccardi

Cd5.01 Otavite
Photo by Giuseppe Siccardi

Cd5.01  OtavitePhoto by Giuseppe Siccardi

Cd5.01 Otavite
Photo by Giuseppe Siccardi

The last specimen for this post is Phosgenite from the Terrible Mine in Custer County, Colorado, USA.  I’m not sure how the mine got it’s namesake, perhaps because it yields ugly specimens such as this:

Pb5.3/4.01  PhosgenitePhoto by Dakota Matrix

Pb5.3/4.01 Phosgenite
Photo by Dakota Matrix

Pb5.3/4.01  PhosgenitePhoto by Dakota Matrix

Pb5.3/4.01 Phosgenite
Photo by Dakota Matrix

Pb5.3/4.01  PhosgenitePhoto by Dakota Matrix

Pb5.3/4.01 Phosgenite
Photo by Dakota Matrix

Ordered from Dakota Matrix, this example is not quite as aesthetically pleasing as some other (much more expensive) examples of Phosgenite I’ve seen for sale that exhibit beautiful euhedral crystals with a lovely transparency.  This heavy specimen consists of a couple of cleavage zones of Phosgenite embedded in a mass of Cerussite.  With this rock my collection of lead carbonates is almost complete, with only one more to obtain (Fassinaite.)

All in all, not a bad start to 2013…

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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