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Mineral Specimens with Franckeite
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5.1 x 4.0 x 1.8 cm. 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 7 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.
6.8 x 5.5 x 3.3 cm. 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 9 mm sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite.
8.2 x 4.4 x 2.1 cm. This specimen is a superb, 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 5 mm sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite.
8.2 x 4.4 x 2.1 cm. From the find of 2004, this specimen hosts two rare sulfosalts. This specimen is a rare, superb, 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 9 mm sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite. The piece has a small amount of associated acicular Jamesonite as well. The Potosiite has been positively identified through X-ray Diffraction.
Superb, sharp xls of several habits, to several mm. 1.6 x 1 x 0.75 cm
Superb, sharp xls of several habits. These occur as both straight crystals and as very large, distinct, highly lustrous, curved crystals (in appearance as if one were to curl their finger). 1.75 x 1.5 x 1.2 cm
Sharp xls of several habits, to 6mm! This is a relatively new occurrence for the species. So far as I am aware from my sources, there were only a handful of these extracted (though it is possible many were simply thrown in the garbage and not recognized for what they were!), and none have been found since the indentity was reported to the Bolivian miners working the San Jose. From what I can gather, previously reported samples were under 2 mm and somewhat granular, indistinct crystals. These occur as both straight crystals to 6mm on this specimen and as very large, distinct, highly lustrous, curved crystals (in appearance as if one were to curl their finger) . I am told that there is only one group of minerals in the world that exhibit a non-commensurate layered crystalline structure and are found with curved crystals, and this is a textbook example of such crystals. 4 x 3.5 x 3 cm
Sharp xls of several habits, to 6mm. This is a relatively new occurrence for the species, as noted only recently by Alfredo Petrov. Both straight crystals and as very large, distinct, highly lustrous, curved crystals (in appearance as if one were to curl their finger) . 5 x 4 x 2 cm
Superb, sharp xls of several habits, to about 4mm. These occur as both straight crystals and as very large, distinct, highly lustrous, curved crystals (in appearance as if one were to curl their finger). 2 x 1.5 x 1.5 cm
Superb, sharp xls of several habits, to several mm, densely coat this specimen. So far as I am aware from my sources, there were only a handful of these extracted (though it is possible many were simply thrown in the garbage and not recognized for what they were!). These occur as both straight crystals and as very large, distinct, highly lustrous, curved crystals. 3 x 2 x 1 cm
6.6 x 3.7 x 2.6 cm. From the new find of 2004, this specimen hosts two of the rarest sulfosalts in the world. This specimen is a very attractive, very rare, superb quality, crystallized specimen of the triclinic lead, antimony, iron, tin sulfosalt Potosiite consisting of extremely rare, highly lustrous, heavily striated, tabular blades (some are twinned) of Potosiite measuring up to 13 mm sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite. The crystals of Potosiite on this specimen are exceptionally large for the species. This new find has completely redefined the species of Potosiite.
8.0 x 5.9 x 2.3 cm. From the 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 7 mm sitting atop crystallized and the equally rare triclinic lead, tin, iron, antimony sulfosalt Franckeite. 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 Potosiite has been positively identified through X-ray Diffraction. This specimen is from a newly opened vein in this historic mine in 2004.
3.7 x 3.5 x 1.5 cm. This is one of the rarest sulfosalts in the world. This specimen is a very rich, very rare, superb quality, crystallized specimen of the triclinic lead, tin, iron, antimony sulfosalt Franckeite consisting of somewhat "sword"-shaped crystals forming a very attractive specimen. 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 pieces like this are few and far between.
2.2 x 1.2 x 1.2 cm. Franckeite is a rare sulfosalt. This is a fine and very rich, pristine specimen of two intergrown, ball-like clusters of starburst-shaped clusters of splendent, elongated franckeite needles. This is undoubtably an older specimen from some small finds at the San Jose Mine of Bolivia where they found franckeite and potosiite some 60 years ago. Ex. Carlton Davis Collection.
One of the rarest sulfides in the world, occuring almost exlcusively from Bolivia. This specimen is a very rich, incredibly rare, superb quality, crystallized specimen of this triclinic lead, tin, iron, antimony sulfosalt. This mineral is exceptionally hard to find in good displays specimens, and less than 1% of all specimens I have ever seen were on matrix! Typical specimens from this mine are crude, crypto-crystalline masses, but this one has excellent, well defined, isolated, sharp crystals oriented into spherical aggregates. A great miniature size specimen for somebody looking to own a rare and highly displayable mineral specimen. This stash presents a great opportunity to acquire a superb collector quality specimen that is rarely offered in today''s market. The piece is easily over 25 years old as this matrix indicates that it came from one of the upper levels of the mine. 4.5 x 4 x 1.5 cm
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Rob Lavinsky, rob@irocks.com
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share specimen![Franckeite (Var: Potosíite) from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-172097a.jpg]](db_pics/mdpics/MD-172097a.jpg)
![Franckeite (Var: Potosíite) from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-172097b.jpg]](db_pics/mdpics/MD-172097b.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-178919a.jpg]](db_pics/mdpics/MD-178919a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-178919b.jpg]](db_pics/mdpics/MD-178919b.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-185389a.jpg]](db_pics/mdpics/MD-185389a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-185389b.jpg]](db_pics/mdpics/MD-185389b.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-185389c.jpg]](db_pics/mdpics/MD-185389c.jpg)
![Franckeite (Var: Potosíite), Franckeite, Jamesonite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-196013a.jpg]](db_pics/mdpics/MD-196013a.jpg)
![Franckeite (Var: Potosíite), Franckeite, Jamesonite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-196013b.jpg]](db_pics/mdpics/MD-196013b.jpg)
![Franckeite (Var: Potosíite), Franckeite, Jamesonite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-196013c.jpg]](db_pics/mdpics/MD-196013c.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-20416a.jpg]](db_pics/mdpics/MD-20416a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-20417a.jpg]](db_pics/mdpics/MD-20417a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-20419a.jpg]](db_pics/mdpics/MD-20419a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-20421a.jpg]](db_pics/mdpics/MD-20421a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-20423a.jpg]](db_pics/mdpics/MD-20423a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-20425a.jpg]](db_pics/mdpics/MD-20425a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-210585a.jpg]](db_pics/mdpics/MD-210585a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-210585b.jpg]](db_pics/mdpics/MD-210585b.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-228415a.jpg]](db_pics/mdpics/MD-228415a.jpg)
![Franckeite (Var: Potosíite), Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-228415b.jpg]](db_pics/mdpics/MD-228415b.jpg)
![Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-228452a.jpg]](db_pics/mdpics/MD-228452a.jpg)
![Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-228452b.jpg]](db_pics/mdpics/MD-228452b.jpg)
![Franckeite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-230533a.jpg]](db_pics/mdpics/MD-230533a.jpg)
![Franckeite, Arsenopyrite from San José Mine, Oruro City, Cercado Province, Oruro Department, Bolivia [db_pics/mdpics/MD-23760a.jpg]](db_pics/mdpics/m/MD-23760a.jpg)