San Juan de Rayas Mine - Level 407
2.2 x 1.3 x .6 CM (thumbnail)
Branching crystals of Acanthite forming a tree-like thumbnail with very bright metallic luster. Complete all around, undamaged and pretty. A very good yet still affordable Silver specie from the famed Guanajuato deposit. This area has been continuously mined for Silver since the discovery in 1585, and this was the world's largest producer for many years. Amazingly there are still a few operating mines and Silver minerals are still found though far less than before.
Wulfenite with Mimetite
Mina Ojuela, Mapimi
4.7 x 3.8 x 2.2 CM (miniature)
Elongated orange Wulfenites crystals free standing on a mixed matrix of Mimentite and gossan. From the epic discoveries in 2017 at Mina Ojuela, this sweet miniature has fine color, luster and is in excellent condition. This was a large find and produced a lot of specimens but few small pieces presented this well.
San Luis Potosi,
9.6 x 8.4 x 5.4 CM (cabinet)
This is both a nice specimen and a fine historic piece as well. The specimen has a slightly faded affixed label from the remarkable collection of Wallace Gould Levison. Details from his ledger (we include a photocopy of the page) says" Bought from William Niven in his new store at 14th street and Broadway (NYC) April 18, 1895". Niven was an important minerologist born in 1850 who was an early partner with the famed dealer George English, later an independent dealer in New York. The specimen is vividly fluorescent and the Hyalite Opal is
perfectly transparent looking like bubbles covering a purplish Chalcedony matrix. The only location given in the notes is San Luis Potosi, this is almost certainly from Tepetate. A very choice piece that is both esthetic and a nice piece of History.
Calcite on Adamite
Mina Ojuela, Mapimi
5 x 4.2 x 2.3 CM (miniature)
Sparkling reddish-pink Calcites encrust and contrast with green Adamite balls. Great luster and vivid color, this is hard to fully appreciate in photos but has really good display impact. Most of the Adamite is fully encased under the Calcite but it is seen clearly at some angles. Ojuela has produced many fine Adamites in many habits during a long history. This color combo is not so common, this miniature piece is in fine undamaged condition and would go well in a suite of choice Mexican minerals.
Milarite on Valencianite and Quartz
Valenciana Mine (Mina La Valenciana), Municipio de Guanajuato
7.8 x 5.8 x 5.4 CM (cabinet)
One of the more uncommon Beryllium Silicate species, Milarite is a real "mineral collectors" specie. This piece is from the find some decades ago in Guanajuato, Mexico. The Matrix is a mix of Quartz and Valencianite (variety of Adularia). The Valencia Mine is the type locality for the Feldspar and was the source of these small bright yellow Milarites which were big news in the mineral world. This piece has several very small crystal and one a bit larger (about 8mm). These are flat habit and the structure is not as evident without good magnification. A fair example of the find that is not crazy expensive.
Carminite with and in Calcite
La Cigüeña Vein area, Mina Ojuela, Mapimi
7.8 x 6.3 x 2.6 CM (cabinet)
An outstanding Carminite specimen from Ojuela found in the early 80's. Even without the Carminite this would be a fine Calcite with elongated glass clear crystals on contrasting matrix. However as these Calcite are resting on and included by bright red prisms and spays of Micro Carminite it is something very special. The matrix is a complex gossan well covered with micro Carminites which are also on the backside but without the Calcites. Some other very small yellow crystals may be Beudantite but are not analyzed, these are well under .05 MM. The Gemmy Calcite is in excellent condition, with bright luster, The quality of the Carminite (as is typical for the specie) is best appreciated under good magnification, by naked eye it looks like a very red rust, however close exam shows thousands of brilliant red sprays, fans, needles and clusters of Carminites. Choice for the specie and excellent for the locality, Carminite is not often seen larger than thumbnail or micro-mount specimens but this is a cabinet sized specimen with a nice display quality.
Polybasite on Acanthite
Guanajuato, Municipio de Guanajuato
3.2 x 2.4 x 1.7 CM (thumbnail)
A killer specimen with exceptional form, the main crystal being textbook perfect, sharp and perfectly defined. Formerly in the collections of Carl Acosta and Brett Keller, this is just barely within the size limit to be classified a thumbnail. The Acanthite matrix is the "melted" look type and is a fine contrast to the large Polybasite. Displays well from either side, what we consider to be the front or best view has a nice metallic patina. Most of the Polybasite we have seen from Guanajuato is more crude or has overgrowths of Pyrite, this is just a superb example of the specie and extraordinary for the locality.
Incredible,an older (1952) Mexican Galena with textbook perfect hoppered, skeletal form crystals. This specimen is from the San Carlos Mine, which in the late 1950 era produced some world class Vanadinite. After many years with no specimens, the mine again produced fine Vanadinites and Wulfenites in 1980 and 2018. We have never seen any other good specimens of Galena from this locale, and this is a choice piece from anyplace. The Galena has a dull luster from micro a micro druze of Anglesite and some Calcite. The forms range from deep hoppers with geometric ridges to intersecting boxes and even spirals. From the collection of Skylar Alverson obtained from G. Hixon in 1952. Outstanding condition and form, just a super Galena and a choice Mexican specimen.