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D06-116 - Cumengeite - $ 1500 SOLD Amelia Mine, Boleo, Baja California, Mexico thumbnail, 0.9 x 0.7 x 0.6 cm ex. John and Linda Stimson ex. Willard Perkin
Incredibly rare, relatively large cumengeite crystal with 5 of the 6 possible point swell developed (and mounted on a thin pedestal from the rear position). is from the 1970s finds here, after Bill Larson and Ed Swoboda rediscovered the 1890's-era locality. Before that time, the only cumengeite specimens were in a few museums. VERY HARD TO OBTAIN TODAY in any quality, of course! Formerly in the collection of and with label of Willard Perkins, the collector who invented the so-called "Perky Box" for thumbnails.
J11T-148 - Cumengeite on matrix - $ 3500 SOLD Amelia Mine, Santa Rosalia, Baja California, Mexico small cabinet, 8.1 x 6.2 x 3.8 cm
This very important rarity specimen features a SHARP, 1.3-cm-long cumengeite crystal perched on SOLID matrix. Very few matrix cumengeites exist. Of them, Most such specimens are on stabilized (glued) matrix. This is not. Furthermore, this crystal has actual lustre whereas most are a bit matte in finish. A sharp, important crystal overall. The associated green mineral is atacamite and the matrix is actually a fairly solid and very hefty chunk of anglesite. Rare and important addition to any Mexican or rarities suites!
J12-450 - Cumengeite - $ 450 Amelia Mine, Boleo, Boleo District, Baja California Sur, Mexico thumbnail, 0.7 x 0.5 x 0.4 cm ex. Ron Pellar
Although seemingly small, this is really quite a nice little treasure. Not only does this cumengeite crystal have the TOP blue color saturation , and relatively high lustre, but it is untwinned. Most cumengeite found is formed as a twinned growth atop boleite. This crystal is a primary, untwinned, doubly-terminated crystal. Ex. Ron Pellar thumbnail collection. Joe Budd photos.
K325 - Cumengeite - $ 1500 SOLD Amelia Mine, Boleo, Santa Rosalia, Baja California, Mexico (1890's) thumbnail, 1.0 x 0.6 x 0.6 cm ex. Charlie Key ex. F.P. D'Esopo
This is a fine thumbnail specimen from the original expeditions of Cumenge in the late 1800s, ex. Sorbonne museum collections. It is a SHARP untwinned cumengeite, showing stereotypical classic form! Most cumengeite forms as twinned growth upon boleite crystals, and thus you have a starburst-shaped crystal habit. However, SOME FEW SPECIMENS from the original find, as is this one, show the untwinned habit. It is not quite pristine - there are a few small dings - but it has a good isplay face where they are hidden from view and "it is what it is," a holy grail of thumbnail and rare species collectors! I have had cumengeites , some larger and priced much higher, in the past. I have NOT had such an example, though, of this habit, before. There is an old label accompanying it which notes that it is a rare untwinned crystal (one of two known to him), from the collection of a Dr. FP D'Esopo. I do not think it is THAT rare, but it IS pretty uncommon. Then again, I now realize the WP on his label indicates that he got the piece from Dr. William Pinch, and Bill tends to be right about these kidns of things....CLICK ON LABEL FOR LINK TO THE COLLECTOR ARCHIVES AT THE MINERALOGICAL RECORD WEBSITE, AND MORE INFORMATION.
MD-114170 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 1.0 x 0.6 x 0.6 cm
This is a fine thumbnail specimen from the original expeditions of Cumenge in the late 1800s, ex. Sorbonne museum collections. It is a SHARP untwinned cumengeite, showing stereotypical classic form! Most cumengeite forms as twinned growth upon boleite crystals, and thus you have a starburst-shaped crystal habit. However, SOME FEW SPECIMENS from the original find, as is this one, show the untwinned habit. It is not quite pristine - there are a few small dings - but it has a good isplay face where they are hidden from view and "it is what it is," a holy grail of thumbnail and rare species collectors! I have had cumengeites , some larger and priced much higher, in the past. I have NOT had such an example, though, of this habit, before. There is an old label accompanying it which notes that it is a rare untwinned crystal (one of two known to him), from the collection of a Dr. FP D'Esopo. I do not think it is THAT rare, but it IS pretty uncommon. Then again, I now realize the WP on his label indicates that he got the piece from Dr. William Pinch, and Bill tends to be right about these kidns of things....CLICK ON LABEL FOR LINK TO THE COLLECTOR ARCHIVES AT THE MINERALOGICAL RECORD WEBSITE, AND MORE INFORMATION. 1.0 x 0.6 x 0.6 cm
MD-215222 - Cumengeite, Pseudoboleite, Boleite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 0.8 x 0.8 x 0.7 cm.
0.8 x 0.8 x 0.7 cm. This is an exemplary example of the epitaxial, or oriented serial growth, of these rare species one upon the other, with sharp form and good color as well. The Cumengeite is the sharp, pyramidal-like outgrowth popping out of one face of the central cube. All of the steppes upon the original simple cube of Boleite are in fact the related species Pseudoboleite. Thick Pseudoboleite epitaxially overgrew the Boleite cube, showing quite clearly even to the naked eye. Interestingly, only boleite is a silver species - the other two have no silver content. The crystals of all 3 species from this, the type locality, remain the best known by an order of magnitude, still today 100 and more years later. Ex. Dick Jones Collection.
MD-22506 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 0.9 x 0.8 x 0.8 cm
A SHARP , complete floater twin of this extremely rare species from the type and best locality. Specimens of this calibre are almost impossible to obtain today! 0.9 x 0.8 x 0.8 cm
MD-22519 - Cumengeite, Boleite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 1.8 x 1.4 x 1.2 cm
These 3 pictures do not do the specimen justice...this is a unique, 3-dimensional specimen featuring an untwinned 1 cm Cumengeite perched caddycorner on the side of a 1 cm boleite cube. I have never seen the like! Most such associations are imbalanced or the cumengeite covers up the boleite completely. This is showy, complete all around, and relatively large for what is available anywhere outside the cases of the Sorbonne. I think it makes for a competition-level thumbnail or rarity specimen. 1.8 x 1.4 x 1.2 cm
MD-266101 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 1.4 x 1.4 x 1.4 cm
1.4 x 1.4 x 1.4 cm (largest). The larger specimen here is 1.4 cm across, and is a classic, sharp, symmetrical cumengeite of high value. The piece dates to older material found at the turn of the 1900s. The smaller specimen next to it is from recent finds (recent meaning in the Larson/Swoboda workings of 1973-1974), and is sharp and fine...but as you can see a bit different in habit from the older material. Either one, in this size, is rare on the market. This specimen from the Dr Miguel Romero collection was on loan exhibition to the University of Arizona Museum for over a decade, until my purchase of this collection in 2008. It was on display in special cases at the museum, and has since been featured in the book "The Miguel Romero Collection of Mexico Minerals" which we sponsored as a special supplement book (published by the Mineralogical Record in December of 2008).
MD-39022 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico miniature, 4.3 x 3.7 x 2.6 cm
A very rare matrix specimen of this important Mexican rarity. It features an 8 mm complete cumengeite mounted nicely for display. The smaller crystal beneath provide color and sparkle, to make this a fairly flashy miniature for a species largely relegated to loose thumbnail crystals after all. 4.3 x 3.7 x 2.6 cm
MD-47759 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 0.3 x 0.3 x 0.2cm
This is a whole bag full of sub-millimeter cumengeite crystals coated on shards of anglesite. The largest piece is just under 1 cm, so all are micros, but still there is a lot of cumengeite here that could be broken up and sold individually as reference specimens if you want. it is assuredly one of the boleites collected during Eduard Cumenge''s famous expeditions in the late 1800s to this locality that described the species. Thus, it might even be fair to say it is co-type since he found it at the same time he brought back the famous larger pieces in the Sorbonne, from which the species was described. 1 x 0.8 x 0.5 - 0.3 x 0.3 x 0.2cm
MD-51162 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 1.3 x 1.1 x 1.1 cm
An incredible cumengeite of super high quality, the best I have seen for sale in fact. It has top lustre, deep blue color, and extremely good 6-point symmetry. It has one truncated rear termination and the bottom termination point is contacted (but you have to mount it somewhere, anyhow?!). Otherwise, it is complete and pristine. This is an incredible rarity and a chance to own a piece of such high calibre that few outside of the Sorbonne actually possess. One of the finest thumbnails I have had to offer... 1.3 x 1.1 x 1.1 cm
MD-53099 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico small cabinet, 7.5 x 5 x 4 cm.
7.5 x 5 x 4 cm. This rare specimen is a treasure for both the quality and richness of matrix cumengeites, and its history. It features very bright, lustrous, sharp cumengeite twins to 6 mm on matrix of the typical soft claylike material, but infused strongly with veins of atacamite and anglesite which lend it a greater sturdiness than usually you see. I exchanged it out of Bill Larson's collection in trade. He got it while doing preparatory investigations prior to reopening and excavating the Amelia Mine in Boleo with Ed Swoboda, in their famous work of 1973 and on. While looking for people with knowledge of past operations from the Cumenge era, 1880s-1900, they found this specimen in Alamos with the son of one of the original miners, to whom it had been given by Cumenge (or taken...who can say?). I have Bill's handwriten card stating this history for the record. In any case, because of the size and richness, this is clearly not one from their 1970s remining operations. It is really unprecedented to be on the market and is a piece he had hoarded for a long time. It came to me only in a very highly leveraged trade.
MD-85412 - Cumengeite - - Archived Amelia Mine, Santa Rosalía (El Boleo), Boleo District, Mun. de Mulegé, Baja California Sur, Mexico thumbnail, 0.9 x 0.7 x 0.6 cm
Incredibly rare, relatively large cumengeite crystal with 5 of the 6 possible point swell developed (and mounted on a thin pedestal from the rear position). is from the 1970s finds here, after Bill Larson and Ed Swoboda rediscovered the 1890's-era locality. Before that time, the only cumengeite specimens were in a few museums. VERY HARD TO OBTAIN TODAY in any quality, of course! Formerly in the collection of and with label of Willard Perkins, the collector who invented the so-called "Perky Box" for thumbnails. 0.9 x 0.7 x 0.6 cm
MZ123 - Cumengeite - $ 2250 SOLD Amelia Mine, Santa Rosalia, Baja California, Mexico miniature, 4.3 x 3.7 x 2.6 cm ex. Martin Zinn
A very rare matrix specimen of this important Mexican rarity. It features an 8 mm complete cumengeite mounted nicely for display. The smaller crystal beneath provide color and sparkle, to make this a fairly flashy miniature for a species largely relegated to loose thumbnail crystals after all.
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