Dolomite - blue crystals
Muzo Mine, Muzo, Municipio de Muzo
5.4 x 4.7 x 4.3 CM (cabinet)
A cluster of sharp blue Dolomite crystals from the famed Emerald Mine at Muzo, Colombia. These crystals are over 1.5 cm across and have good luster, form and a color much like a nice Celestite. We obtained this piece in a lot we purchased from the miners in Colombia. They were initially certain they had made a big find of Euclase and were expecting to be very rich. After they learned the sad news that this was "only" Dolomite they were later happy to know that we valued the blue color far more than the normal white and bought everything! Blue Dolomite crystals are in general rare.
SOLD Magnetite - Vintage Swiss
stock #SOLD 18.1-642
Zermatt, Matt Valey, Zermatt-Sass Fee area
2.5 x 2.1 x 1.5 CM (thumbnail)
A neat old Swiss thumbnail of well-formed Magnetite octahedrons. Ex A. Kranz, his original label can be dated being written between 1850 to 1888. In good but not perfect condition, magnification finds some small edge roughness. The luster is better than most we have seen, this seems to be nearly Magnetite and crystallized on several sides. This was also in the Jeff Glover collection (all labels included ) which was dedicated to Swiss Alpine minerals.
Cerussite crystals in several habits with an unknown inclusion that gives a yellow-orange color. The matrix is typically complex and very three-dimensional. Tsumeb Cerussites were found in every imaginable form and sometimes colored by inclusions. This color is very unusual, and we have not seen this before. Under strong magnification the inclusions appear to be fibrous and aligned along the crystal axis. With Tsumeb minerals mysteries are a big part of the fun. The condition of this piece is also remarkable, there is no damage even though the Cerussites are well-exposed and prominent.
Bournonite is so often twinned or in classic "cogs-wheel" form that untwinned crystals are quite rare. This Quiruvilca (Peru) specimen is that unusual sort, here are many Bournonite crystals, some over 1.2 cm but no twins. In fine condition overall most crystals are perfect but with good magnification some small areas of rough edges are found. For this notoriously fragile specie that is impressive. Some bright golden pyrite adds contrast to the dark silver-metallic Bournonite. For some reason the Pyrite at Quiruvilca Mine is often especially bright and lustrous, it seems to be more stable than most and keeps the bright golden color much better than any other Pyrite I know. A fine addition to a serious Sulfide collection
A flat habit rhombohedral crystal of Rhodochrosite sits aesthetically on matrix. Tiny purple Fluorite and Pyrite is also on the front face of the Rhodo adding some character. The matrix has clusters of elongated white Apatites (not visible in the photos) mostly on the backside. These are vividly fluorescent (yellow) in long wave. The condition is excellent and the Rhodo is partly transparent. Better color than is usually seen, this piece was from the earliest finds of Rhodochrosite at Wudong. I do not think any Apatites were found in the later pockets.
A killer quartz "tree" or tangled shrub of slender Quartz crystals with a mint-green color perched on a matrix of large Dolomite crystals. Mined in 2006 at the famed Shangbao Mine, this is a really distinctive display piece. Many of the Quartz are doubly terminated and the condition overall is excellent. Shangbao is justly famous for some of the best Fluorites in the world. However, there were also a few finds over the years of highly esthetic and often odd Quartz. A unique piece that mixes fine quality, good size and display impact.
Dioptase - type locality
Altyn-Tyube, Kirghiz Steppes
5.8 x 4.1 3.6 CM (cabinet)
Like green eggs in a nest, a pair of very well-exposed Dioptase crystals from the classic Altyn-Tyube Mine. This is the type locality for the specie. The crystals are complete, well-formed, doubly terminated and undamaged. The overall esthetics are super for the locality and at 1.3 cm these are bigger than average.
Geometrically aligned Galena crystals dominate this complex multi-specie piece from the famed Madan area. We have been awed by the diversity and quality of Galenas and Sphalerites from Madan, which is probably the world's best source for these. Every few years a new habit or style is found. This was mined in 2009, it is in perfect, undamaged condition. The Galena Luster is dull metallic which is contrasted by the bright Sphalerite and Chalcopyrite. It is easy to understand why some collectors love Sulfides and especially Galenas.