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15 specimens listed
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Sulphur - large hoppered crystals
stock #21.1-342
El Desierto Mine, San Pablo de Napa, Daniel Campos Province
Potosi, Bolivia
6.4 x 3.2 x 2.4 CM (cabinet)
price: $725


Very pure Sulphur in textbook perfect crystals showing aligned prism forms and hoppered faces. Excellent bright yellow color and in undamaged condition, a modern classic. The El Desierto Mine is a rather small operation located on the flanks of a volcano at very high elevation. It has not been worked for a few years and when we visited the locality some time ago it was really inhospitable to say the least. However the best Sulphur specimens in recent decades have come from here. Better pieces like this have vivid canary yellow color, very bright luster and are rather transparent. The color is much brighter than most specimens of the other classic localities (Sicily and Russia) and there is no hint of Petroleum inclusions that are common elsewhere. These large crystals show very clear epitaxial stacking and exceed 5 CM. Choice for the locale and for the specie. Far better than the usual quality from this unusual place.

Frankeite - well-crystallized
stock #21.1-284
San Jose Mine, Oruro
Potosi, Bolivia
4.6 3.8 x 3.7 CM (miniature)
price: $880


A complete floater, crystallized on all sides with slender blade-like crystals of Frankeite radiating in clusters and ball-like aggregates. An incredibly rare mineral, all the best specimens known came from just a few small finds in Bolivia, this is a superb example from what may be the best of those discoveries about 35 years ago. Not long ago Frankeite was often called the rarest Sulfosalt in the world. That may have been true then but today that statement is not true though it is still very super rare. The well-formed balls and clusters are distinctive for this special find at the San Jose Mine. In excellent condition, this displays well from any angle. Ex Dr. Eugene Sensei Collection. As far as we know there have been no more found since about 2005.

Stannite with Zinkenite on Pyrite
stock #7.AE-195
San Jose Mine, Oruro
Oruro Department, Bolivia
6.4 x 4.6 x 3.1 CM (cabinet)
price: $650
Late Summer 2021

Stannite is somewhat rare Sulfide that is not usually attractive unless it has some contrast with its matrix or a very good form. This specimen has a bright sparkling Pyrite matrix with excellent luster that hosts some Stannites in well-formed, complex twinned crystals. The largest Stannite is 1.3 CM across. There is a little Zinkenite in the mix as small but fat needle-like crystals that need a close examination to find. This is from the San Jose Mine which has produced many incredible rare Sulfides and Sulfosalt specimens over the years. This piece is roughly 20 years old from the golden age of this important locale. There is no sign of degradation to the Pyrite and the Stannite is undamaged. A really attractive setting for the dark sulfides nestled in a golden matrix.

Franckeite var. Potosiite - exceptionally well-crystalized
stock #7.AE-193
San Jose Mine, Oruro
Oruro Department, Bolivia
7.9 x 4.1 x 3.8 CM (cabinet)
price: $2400
Late Summer 2021

Franckeite has always been an incredibly rare mineral and was only known in micro crystals until the major find in 2004 of what was then called Potosiite. This is now known to be a variety of Franckeite with less tin than usual. This was not a large find but the better specimens were quickly gobbled up by collectors and are almost never available now. This piece was one of those major specimens, it is from a collection we are liquidating for the owner and retains the original Kosnar label. In incredible condition for this delicate mineral with individual crystals that reach over 1 CM, in clusters and free standing masses. This piece also has crystals of the original Franckeite that is not the Potosiite variety so this brings two of the world's rarest Sulfosalts on a single matrix. For the species, this is also an esthetic piece, with very three dimensional form and a good metallic luster.

Phosphophyllite - crystals in fossil clamshell cast.
stock #21.1-138
Huaylliani Phosphphyllite Diggings, Huayllani, Canutillas. Machacamarca,
Potosi, Bolivia
7.2 x 4.9 x 2.8 CM (cabinet)
price: $3800
Early summer 2021

Fine Phosphophyllite crystals nearly fill the void of a fossil clam shell with the center area still open. The center void has dozens of sharp terminations surrounding the middle. Some crystals show the classic "swallowtail" twinning habit and all are a translucent apple green. This is one of the very best specimens I have seen from a small find made in 2009-2010. Phosphophyllite in sizable crystals is rare and one of the "holy grail" species. Outside of Bolivia nearly all other specimens are quite small, measured in millimeters, and most are micros. This locality is about 45 KM from the more famous mines at Cerro Rico which is also in Potosi, Bolivia. The best specimens from Cerro Rico are highly prized, being both rare and some the most expensive mineral specimens in the world. This smaller find at Huaylliani more than a decade ago was huge news in the mineral world back then. While the crystals from here are not as gemmy and clear as the best from Potosi, they are still very fine and would rank as the second best in the world. The find is long ago finished and these are now quite prized as well. The largest crystals on this piece are over 2 CM but most are smaller. An unusual piece, very large for the area, this has both lustrous areas and some lightly frosted crystal faces. Minimal matrix, this is over 78 grams of nearly pure Phsopophyllite. The shape of the clam shell is still somewhat visible on the backside but the open vug of the green Phosphophyllite crystals is the real star here. In excellent condition overall, a few small Iron stains are present on some edges though the crystals are very clean. An outstanding piece from this important find.

Paravauxite and Wavellite on Quartz
stock #20.FC-007-(9086)
Siglo XX mine, Llallagua, Bustillos Province
Potosi, Bolivia
10.4 x 7.3 x 4.3 CM (cabinet)
price: $1450
Early summer 2021

A superb large cabinet specimen of very fine aesthetic composition. A plate of Quartz crystals are entirely encrusted with tiny sparkling prisms of clear Paravauxite and a few scattered balls of Wavellite. In fantastic condition as seen, this is a very rich specimen of these two Phosphates and has a subtle creamy yellow to greenish tint best seen in person. The balls of Wavellite reach 1.5 CM and are composed of creamy radiating crystals with a pearly luster. The Paravauxite crystals are more equant prisms than the typical flat habit, the luster and transparency is excellent. Though those crystals are small the overall display impact and three dimensional architecture is superb for the specie.

Andorite (exceptional large crystals) with Zinkenite
stock #7-BOL-199-(stk)
San Jose Mine, Oruro
Oruro Department, Bolivia
4.7 x 3.5 CM (miniature)
price: $1100
new year 2021

A fine and attractive specimen of this rare Lead, Silver, Antimony "black ugly" mineral. Until the 2004 find, Andorites were one of the rarer Sulfosalts and crystals were always quite tiny. This piece is from that discovery and unusually esthetic, excellent for the size, condition and distinct form of these crystals. The metallic luster and steel to brassy hues are as good as these ever get. Ex Kosnar, there are now very few of this caliber to be found. An outstanding example of this rare Silver specie.

Sulphur - unusual large skeletal crystal
stock #8.AE-1008
El Desierto Mine, San Pablo de Napa, Daniel Campos Province
Potosi, Bolivia
5.7 x 3.2 x2.5 CM (cabinet)
price: $380
new year 2021

Very odd, single large etched crystal of Sulphur, complete all around and complexly stepped. Bright color and in perfect condition, this high elevation locality at one time produced a few fantastic world class Sulphur crystals. Sulphur is a common element world wide but there are few good crystal localities. The former mines in Sicily, Russia and Bolivia were the greatest sources and specimens from each are completely different. The legendary Rock Currier was very involved in importing Sulphur specimens from here years ago. When we visited the locality in 2012 it was completely shut down with nobody there. I am not sure if it has worked since. This specimen is from over 25 years ago.