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Bolivian Cassiterite, Magnetite and Ferberite Mix




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(click on highlighted picture to enlarge)

Ferberite ( Ferberite ( Ferberite (


No. FERB BOL 5075 - $ 950.00

Ferberite ("The Dragon") on Arsenopyrite

Locality: Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia

Specimen Size: 11.5 x 9.5 x 6.0 cm (cabinet)
Largest Ferberite: 1.3 cm.


The mine at Tasna has produced some of the finest Ferberite specimens in the world, easily rivaling the best pieces from Panasqueira or China. I have personally imported more top shelf Ferberite specimens from this mine in the last 10 years than I can remember seeing in most collections combined. The diversity of habits combined with the stunning quality of the crystals has made the Ferberites from Tasna one of the "must haves" from Bolivia in recent years. Many people refer to this species as "Wolframite", which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited due to the fact that the ideal chemical composition for Wolframite does not exist in nature. This specimen is an impressive piece because matrix Ferberites are not very common, especially in such highly aesthetic display specimen. A greater number of Ferberites from Tasna are found off matrix due to the fact that they crystals are simply so dense that their weight forces them off the matrix during blasts underground. This piece is comprised of dozens of sharp, lustrous, jet black, bladed crystals of Ferberite associated with a few gemmy "needle" Quartz crystals forming the shape of a "Dragon" on massive Arsenopyrite matrix. The piece almost looks like an ancient headpiece on the bow of a Viking warship. The fact that piece is on matrix makes it a prize within itself, but to top it off the piece has great aesthetics as well, which cannot be said many of the matrix Ferberites from Tasna. A great quality and striking display specimen for a species that does not often form in attractive specimens.

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Ferberite on Arsenopyrite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5071 (2).JPG] Ferberite on Arsenopyrite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5071 (4).JPG] Ferberite on Arsenopyrite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5071 (6).JPG] Ferberite on Arsenopyrite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5071 (5).JPG]


No. FERB BOL 5071 - $ 695.00

Ferberite on Arsenopyrite

Locality: Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia

Specimen Size: 12.0 x 8.3 x 8.2 cm (cabinet)
Largest Ferberite: 5.0 cm.


Please note that this specimen looks much better in person than the photos would indicate. It was very difficult to photograph. With that said, The mine at Tasna hast produced some of the finest Ferberite specimens in the world, easily rivaling the best pieces from Panasqueira or China. I have personally imported more top shelf Ferberite specimens from this mine in the last 10 years than I can remember seeing in most collections combined. The diversity of habits combined with the stunning quality of the crystals has made the Ferberites from Tasna one of the "must haves" from Bolivia in recent years. Many people refer to this species as "Wolframite", which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited due to the fact that the ideal chemical composition for Wolframite does not exist in nature. This specimen is an impressive piece because the heavy Ferberite crystals survived the blast in the mine as stay on matrix. A greater number of Ferberites from Tasna are found off matrix due to the fact that they crystals are simply so dense that their weight forces them off the matrix during excavation. This piece is comprised of several sharp, lustrous, rather thick, jet black, tabular crystals of Ferberite sitting atop platy Arsenopyrite crystal matrix. There are a few trivial contacts on a few crystals, but the overall condition of the specimen is superior to most from this mine. To top it off the piece has great aesthetics as well, which cannot be said many of the matrix Ferberites from Tasna.

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Ferberite (Large twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5072 (1).JPG] Ferberite (Large twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5072 (7).JPG] Ferberite (Large twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5072 (6).JPG] Ferberite (Large twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5072.JPG] Ferberite (Large twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5072 (3).JPG]


No. FERB BOL 5072 - SOLD

Ferberite (Large twin)

Locality: Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia.

Specimen Size: 9.2 x 5.0 x 4.3 cm (small cabinet)


The mine at Tasna has produced some of the finest Ferberite specimens in the world, easily rivaling the best pieces from the Panasqueira mine in Portugal or the Yaoganxian mine in China. The finest TWINNED Ferberites in the world come from this mine, and they simply have no rival from any world locality. This species was sometimes previously referred to as "Wolframite", which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited. From the historic find of 2005 (virtually every piece from this find came through my hands) this particular piece represents one of the very finest quality and exceptionally large twinned crystals of Ferberite to date. It is a fantastic small cabinet size specimen with superb form and quality. This piece exhibits the classic, "butterfly" twinning of Ferberite along the a { 100 } face. It is an impressive, sharp, semi lustrous, aesthetic, jet-black twinned crystal with a gemmy prismatic Quartz crystal at the base. This specimen is displayable from several angles, and is quite hefty as Ferberites tend to be in this size. The piece is in exceptionally good condition, with virtually no damage to the diplay side, and it is complete on both the top and bottom of the twin unlike so many that are cleaved on one side. You just don't see these for sale in this size and quality. These Ferberite twins are highly sought after as this find set a new standard of excellence for twinned Ferberites around the world. Fine twins occur in only about 10 percent of all the specimens I've seen from this mine, and twins this size are virtually unheard of.



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Ferberite (twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5073.JPG] Ferberite (twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5073 (1).JPG] Ferberite (twin) from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia. [./BolMix507and707/FerbBol5073 (2).JPG]


No. FERB BOL 5073 - $ 275.00 SOLD

Ferberite (twin)

Locality: Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia.

Specimen Size: 3.2 x 2.7 x 2.5 cm (miniature)


The mine at Tasna has produced some of the finest Ferberite specimens in the world, easily rivaling the best pieces from the Panasqueira mine in Portugal or the Yaoganxian mine in China. The finest TWINNED Ferberites in the world come from this mine, and they simply have no rival from any world locality. This species was sometimes previously referred to as "Wolframite", which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited. This specimen is from the historic find of 2005 (virtually every piece from this find came through my hands). This piece is a fantastic specimen with superb form and quality. This piece exhibits the classic, "butterfly" twinning of Ferberite along the a { 100 } face, and is somewhat of a "closed" twin and opposed to showing a wider reentrant angle. The piece features a very sharp, rather lustrous, aesthetic, jet-black twinned crystal with a few tabular blades of Ferberite of equal quality and several gemmy prismatic Quartz crystals at the base. The quality is top notch on this specimen as most piece were not nearly as sharp and brilliant as this little beauty. The piece is in exceptionally good condition, with virtually no to the twin itself. These Ferberite twins are highly sought after as this find set a new standard of excellence for twinned Ferberites around the world. Fine twins occur in only about 10 percent of all the specimens I've seen from this mine, and very rarely in this quality.

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(click on highlighted picture to enlarge)

Ferberite with Arsenopyrite and Marcasite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5074.JPG] Ferberite with Arsenopyrite and Marcasite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5074 (1).JPG] Ferberite with Arsenopyrite and Marcasite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5074 (2).JPG] Ferberite with Arsenopyrite and Marcasite from Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia [./BolMix507and707/FerbBol5074 (3).JPG]


No. FERB BOL 5074 - $ 700.00

Ferberite with Arsenopyrite and Marcasite

Locality: Tasna mine, Rosario section of Cerro Tasna, Atocha-Quechisla District, Nor Chichas Province, Potosi, Department, Bolivia

Specimen Size: 12.5 x 9.8 x 3.8 cm (cabinet)
Largest Ferberite: 2.0 cm.


Please note that this specimen looks much better in person than the photos would indicate. It was very difficult to photograph. With that said, t he mine at Tasna has produced some of the finest Ferberite specimens in the world, easily rivaling the best pieces from the Panasqueira mine in Portugal or the Yaoganxian mine in China. This species was sometimes previously referred to as "Wolframite", which was supposed to be an intermediary species between Ferberite and Hubnerite, but has since been discredited. From the historic find of 2005 (virtually every piece from this find came through my hands), here we see one of the finest association specimen of this material to come out. One rarely finds Ferberite associated with any species, let alone two species with good color contrast. This specimen was the only one of its kind from this major find. It features several top quality, sharp, highly lustrous, bladed, jet-black, "stepped" crystals of Ferberite which are associated with exceptionally sharp, gun metal color crystals of tabular Arsenopyrite and bright botryoidal groups of Marcasite. The habit of the Ferberite crystals themselves is like none other I've seen form this mine, and the Arsenpyrite crystals are as large and sharp as I've seen associated with any other Ferberite specimen. This piece is by far away one of the most impressive and highly attractive association specimens of this material. Virtually every crystal is in perfect condition, and the pictures do not do this piece justice. It may not be a large twin, but the quality is there on this piece, trust me.

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(click on highlighted picture to enlarge)

Cassiterite from Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia [./BolMix507and707/CassBol5071 (1).JPG] Cassiterite from Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia [./BolMix507and707/CassBol5071 (3).JPG] Cassiterite from Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia [./BolMix507and707/CassBol5071 (4).JPG] Cassiterite from Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia [./BolMix507and707/CassBol5071 (2).JPG]


No. CASS BOL 5071 - SOLD

Cassiterite

Locality: Huanuni mine, Huanuni, Dalence Province, Oruro Department, Bolivia

Specimen Size: 4.3 x 3.6 x 3.5 cm (miniature)


Bolivia is probably best known for its Cassiterite specimens which are found in dozens upon dozens of mines in a multitude of habits. Cassiterite has been mined for tin ore in Bolivia for a long time, and the majority of the tin supplied to the U.S. during WWII came directly from the Bolivian tin mines. Almost every Cassiterite crystal from Bolivia is twinned in one way or another, though single crystals are found from time to time. With that said, I've never quite seen a cluster of twinned crystals like this in my entire time dealing with Bolivian minerals. This piece is comprised of dozens of superb quality, sharp, highly lustrous, jet-black, cyclic twinned crystals which are intergrown forming a unique "pine cone"-shaped aggregate. I can honestly say that this is one of the most intriguing Cassiterite specimens I've handled, especially from Huanuni, as most specimens like this are found at mines like Viloco. The piece is crystallized 3/4 of the way around, and is in very good condition overall. It is also a very cool novelty specimen that would fit into a Bolivian suite, a Cassiterite collection, a nice miniature collection or a general collection of unusual twins ! This is the only piece that I have to offer, and it may very well end up being another one of a kind specimen from this storied locality.



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(click on the pictures to enlarge)

Magnetite from Cerro Huanaquino, Potosi Department, Bolivia [./BolMix507and707/MagBol5071.JPG] Magnetite from Cerro Huanaquino, Potosi Department, Bolivia [./BolMix507and707/MagBol5071 (1).JPG]


No. MAG BOL 5071 - SOLD

Magnetite

Locality: Cerro Huanaquino, Potosi Department, Bolivia

Specimen Size: 9.5 x 5.7 x 2.5 cm (cabinet)
Largest crystal: 2.0 cm.


Many collectors are familiar with Magnetite, but most of them do not have a superb example of the species in their collections. The most well known Magnetite specimens were found in the Binntal in the Swiss Alps nearly 50 years ago, and despite their impeccable quality, most specimens only feature a solitary crystal on matrix, usually in the 1 centimeter range. These new Bolivian Magnetite specimens are nearly on par with the Swiss pieces, and in some cases are superior, especially when it comes to the size of the crystals. Magnetite is often crude and dull from most localities, so to find sharp, lustrous crystals like this is a real treat. It must be noted that these are the finest Magnetite specimens available on the market today, and honestly the best that have been available in nearly half a century. Typically the Magnetite specimens from this find in Bolivia are closely grown together, and this is a great example of said material. The piece has excellent quality, remarkably large, razor sharp, highly lustrous, silvery black color, "Alpine-type" octahedra scattered all over this specimen on matrix. This piece truly has some of the greatest aesthetics, combined with some of the largest crystals that I've seen from this find. I will say that a few of the crystals have trivial nicks here and there, but they don't take away from the outward beauty of this specimen. Let me put it this way, if this piece were from the Swiss Alps, the damage would be insignificant as the sheer size of the crystals would be all the mattered to many collectors.



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(click on highlighted picture to enlarge)

Magnetite from Cerro Huanaquino, Potosi Department, Bolivia [./BolMix507and707/MagBol5073 (2).JPG] Magnetite from Cerro Huanaquino, Potosi Department, Bolivia [./BolMix507and707/MagBol5073 (4).JPG] Magnetite from Cerro Huanaquino, Potosi Department, Bolivia [./BolMix507and707/MagBol5073 (3).JPG] Magnetite from Cerro Huanaquino, Potosi Department, Bolivia [./BolMix507and707/MagBol5073 (1).JPG]


No. MAG 5073 - SOLD

Magnetite

Locality: Cerro Huanaquino, Potosi Department, Bolivia

Specimen Size: 8.8 x 4.9 x 4.7 cm (small cabinet)
Largest crystal: 2.7 cm.


Many collectors are familiar with Magnetite, but most of them do not have a superb example of the species in their collections. The most well known Magnetite specimens were found in the Binntal in the Swiss Alps nearly 50 years ago, and despite their impeccable quality, most specimens only feature a solitary crystal on matrix, usually in the 1 centimeter range. These new Bolivian Magnetite specimens are nearly on par with the Swiss pieces, and in some cases are superior, especially when it comes to the size of the crystals. Magnetite is often crude and dull from most localities, so to find sharp, lustrous crystals like this is a real treat. It must be noted that these are the finest Magnetite specimens available on the market today, and honestly the best that have been available in nearly half a century. Typically the Magnetite specimens from this find in Bolivia are closely grown together, but this piece has superb isolation between the crystals. The piece has excellent quality, remarkably large, razor sharp, highly lustrous, silvery black color, "Alpine-type" octahedra which are associated with creamy Feldspar crystals on matrix. This piece truly has some of the greatest aesthetics, combined with some of the largest crystals that I've seen from this find. It is one of the finer small cabinet size specimens from the lot and will display very nicely. I will say that a few of the crystals have trivial nicks here and there, but they don't take away from the outward beauty of this specimen. Let me put it this way, if this piece were from the Swiss Alps, the damage would be insignificant as the sheer size of the crystals would be all the mattered to many collectors.



To order this specimen click here



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