Tag Archives: carbonate

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…

Baddeleyite, Villiaumite, Rickardite, Koutekite, and Bismutite

A couple of weeks ago I received my order for 5 new additions to my collection, all from Dakota Matrix

The first is a specimen of Baddeleyite, occurring as tiny black lustrous crystals to 2 mm on a chunk of quartzy matrix; it originates from the Jacupiranga Mine in São Paulo, Brazil.  In the three years I’ve been systematically collecting minerals, I’ve never before seen this species for sale at any of my on-line haunts, so naturally I snapped it up.  This brings my Zirconium suite down to one remaining species left to obtain.  The specimen also has many greenish grey crystals of Forsterite.

Zr4.01  BaddeleyitePhoto by Dakota Matrix

Zr4.01 Baddeleyite
Photo by Dakota Matrix

Zr4.01  BaddeleyitePhoto by Dakota Matrix

Zr4.01 Baddeleyite
Photo by Dakota Matrix

Another addition to my Sodium suite is Villiaumite , which completes the Halide section of the suite.  As blocky cherry-red crystals protruding from the matrix, this is a somewhat standard specimen from the mineral rich area of Mont-Saint Hilaire, Québec, Canada.

Na3A.01  VilliaumitePhoto by Dakota Matrix

Na3A.01 Villiaumite
Photo by Dakota Matrix

Na3A.01  VilliaumitePhoto by Dakota Matrix

Na3A.01 Villiaumite
Photo by Dakota Matrix

The next two specimens are members of the copper sulphide family, Rickardite and Koutekite.  The Rickardite is one of three applicable copper telluride species and this example hails from the Hilltop Mine in Dona Ana County, New Mexico, USA.  This specimen has a really nice metallic blue foil-like quality, very similar in appearance to some examples of Covellite; also present are small gold tinged cubic crystals of Altaite.

Cu2E3/3.01  RickarditePhoto by Dakota Matrix

Cu2E3/3.01 Rickardite
Photo by Dakota Matrix

Cu2E3/3.01  RickarditePhoto by Dakota Matrix

Cu2E3/3.01 Rickardite
Photo by Dakota Matrix

Cu2E3/3.01  RickarditePhoto by Dakota Matrix

Cu2E3/3.01 Rickardite
Photo by Dakota Matrix

The Koutekite comes from the Mohawk Mine in the famous copper mining county of Keeweenaw in Michigan, USA.  There are four applicable copper arsenide species for my collection, and it appears they are often found together in various amounts, perhaps unavoidably, as this specimen also contains Paxite.  The original advertised description read “silvery grey metallic mineral with Paxite;” I can’t visually distinguish between the Paxite and the Koutekite…

Cu2B4/4.01  KoutekitePhoto by Dakota Matrix

Cu2B4/4.01 Koutekite
Photo by Dakota Matrix

Cu2B4/4.01  KoutekitePhoto by Dakota Matrix

Cu2B4/4.01 Koutekite
Photo by Dakota Matrix

The last specimen is Bismutite, which I purchased (impulsively) as a sort-of inexpensive after thought.  Apparently this species is somewhat rare, although this is a rather crude example of the only applicable bismuth carbonate…

Bi5.01  BismutitePhoto by Dakota Matrix

Bi5.01 Bismutite
Photo by Dakota Matrix

Bi5.01  BismutitePhoto by Dakota Matrix

Bi5.01 Bismutite
Photo by Dakota Matrix

This chunk of a specimen is from the Outlaw mine in Maricopa County, Arizona, USA.  With this addition I now start off the somewhat extensive Bismuth suite