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Mineral Specimens with Franckeite
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8.8 x 6.8 x 3.7 cm. From the great find of 2004. This specimen is a very attractive, very rare, superb quality, crystallized specimen of Potosiite consisting of several, extremely rare, highly lustrous, heavily striated, tabular blades (some are twinned) of measuring up to 5 mm sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite, and some thin acicular crystals of another sulfosalt (most likely Jamesonite or Boulangerite). Perhaps the most interesting aspect of the piece is the fact that there is some host rock matrix underneath the Potosiite and Franckeite, which is rarely seen from this locality. The crystals of Potosiite on this specimen are exceptionally large. Before these new specimens were discovered, some of the largest known crystals of Potosiite were massive, uncrystallized, granules less than 1 mm. in most cases. This find completely redefined Potosiite. These are undoubtedly some of the largest known potosiite crystals in existence. I have been told that the part of the mine that produced these specimens is now mined out and will most likely never produce these impressive specimens again.
From the new find of 2004, this specimen hosts two of the rarest sulfosalts in the world. This specimen is a very attractive, incredibly rare, superb quality, crystallized specimen of the triclinic Lead, Antimony, Iron, Tin sulfosalt Potosiite consisting of a few highly lustrous, heavily striated, tabular blades of Potosiite measuring up to 9 mm (!) sitting atop crystallized and the equally rare triclinic Lead, Tin, Iron, Antimony sulfosalt Franckeite. For those of you who are unaware, the crystals of Potosiite on this specimen are EXCEPTIONALLY LARGE for the species. Before these new specimens were discovered, some of the largest known crystals of Potosiite were massive, uncrystallized, granules less than 1 mm. 5.5 x 4.2 x 3.8cm
This is one of the rarest sulfosalts in the world. This specimen is a very rich, incredibly rare, superb quality, crystallized specimen of the triclinic Lead, Tin, Iron, Antimony sulfosalt Franckeite consisting of "sphere"-shaped aggregates. A good opportunity to acquire something that is rarely offered in the open market. This species belongs to the only group of minerals that forms in naturally "round" or "cylindrical" shaped crystals. This specimen is over 30 years old and was part of the best find of the material. 6.0 x 4.3 x 3.3cm
From the new find of 2004. A few highly lustrous, heavily striated, tabular blades of Potosiite measuring up to 8 mm (!) sitting atop Franckeite. For those of you who are unaware, the crystals of Potosiite on this specimen are EXCEPTIONALLY LARGE for the species. Before these new specimens were discovered, some of the largest known crystals of Potosiite were massive, uncrystallized, granules less than 1 mm. in most cases. The Potosiite has been positively identified through X-ray Diffraction. This specimen is from a newly opened vein in this historic mine. 6.0 x 4.9 x 4.6cm
This is one of the rarest sulfosalts in the world. This specimen is a very rich, incredibly rare, superb quality, crystallized specimen of the triclinic lead, tin, iron, antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals oriented into spherical aggregates forming the shape of a flower. A great small cabinet specimen for somebody looking to own a rare and highly displayable mineral specimen. A good opportunity to acquire something that is rarely offered in the open market for a great price. This species belongs to the only group of minerals that forms in naturally "round" or "cylindrical" shaped crystals. This specimen is over 30 years old and was part of the best find of the material. There were only a handful of good specimens, and well crystallized display pieces like this are few and far between. 6.5 x 4.6 x 2.8cm
From the new find of 2004, this specimen hosts two of the rarest sulfosalts in the world. This specimen is a very attractive, incredibly rare, superb quality, crystallized specimen of the triclinic lead, antimony, iron, tin sulfosalt Potosiite consisting of several, extremely rare, highly lustrous, heavily striated, tabular blades (some are twinned) of Potosiite measuring up to 8 mm (!) sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite. For those of you who are unaware, the crystals of Potosiite on this specimen are EXCEPTIONALLY LARGE for the species. Before these new specimens were discovered, some of the largest known crystals of Potosiite were massive, uncrystallized, granules less than 1 mm. in most cases. This new find has completely redefined the species of Potosiite. The crystals on this specimen are NOT micros, you can clearly see them with the naked eye and they are very distinct. These are undoubtedly some of the LARGEST KNOWN POTOSIITE CRYSTALS IN EXISTENCE. The Potosiite has been positively identified through X-ray Diffraction. This specimen is from a newly opened vein in this historic mine. 6.3 x 5.8 x 4.2cm
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Rob Lavinsky, rob@irocks.com
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share specimen![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-284796a.jpg]](db_pics/mdpics/MD-284796a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-284796b.jpg]](db_pics/mdpics/MD-284796b.jpg)
![Franckeite (Var: Potosíite) from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-49142a.jpg]](db_pics/mdpics/MD-49142a.jpg)
![Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-49190a.jpg]](db_pics/mdpics/MD-49190a.jpg)
![Franckeite (Var: Potosíite) from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-60180a.jpg]](db_pics/mdpics/MD-60180a.jpg)
![Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-70638a.jpg]](db_pics/mdpics/MD-70638a.jpg)
![Franckeite (Var: Potosíite) from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-70645a.jpg]](db_pics/mdpics/MD-70645a.jpg)