Well-defined twinned microcline crystal from a very unusual locality, not seen in collections. It cbelongs from the collection of Peter Seroka, known for his interest in feldspars.

Size: 6.2 x 3.5 x 2.7 cm.

Col. Peter Seroka (L'Escala, Girona) #987

Cerussite specimens from the Mibladen area are usually yellowish. In this specimen from the Seroka collection we can see very brilliant and transparent crystals and the largest ones are cyclically twinned. This type of specimen is not common in this area. It fluoresces weakly yellow under UV light.

Size: 5.7 x 3.9 x 3.9 cm.
Main crystal: 11 mm.

Col. Peter Seroka (L'Escala, Girona) #614
Fluorescent under long wave UV

Group of tourmaline schorl crystals in parallel growth, with an intense black color and brilliance. With defined top terminal faces. It belongs from the collection of Peter Seroka (L'Escala, Catalonia).

Size: 6.3 x 4.2 x 2.8 cm.

Col. Peter Seroka (L'Escala, Girona) #599

Excellent specimen of scolecite from a locality rarely seen in collections, located in the east of Iceland. It is a radiated aggregate of crystals, with an intense white color, luster and good size. A curiosity arrived from the cold lands.

Size: 8.5 x 7.5 x 4.4 cm.

Col. E. Nicolau (Barcelona).

Excellent and aesthetic specimen formed by a large group of fluorite crystals, very well defined, with a cubic shape and beveled edges by the dodecahedron forms. Translucent, with purple zoning colour. They are disposed on a white calcite matrix, on which they contrast. A piece for the best display.

Size: 7.7 x 7.5 x 4.2 cm.
Main crystal: 15 x 10 mm

Botryoidal aggregates of smithsonite with a very tastefull bluish green colour, translucent and with brilliance. They are disposed on matrix. From a very interesting American locality. It fluoresces intensely under LW-UV light.

Size: 9.5 x 6.2 x 3.8 cm.

Fluorescent under long wave UV

Various small but very defined torbernite crystals. They are arranged on a matrix of crystallized quartz. Unusual for this Portuguese town.

Size: 9.6 x 5.3 x 3.9 cm.

Presents radioactive activity.

Group of microcline crystals, of good size, defined and brilliant, showing the Manebach twin, characteristic of this species. With J. Viñals handwritten label.

Size: 6.4 x 4.4 x 3 cm.

Vesuvianite crystal, with defined faces, doubly terminated, green to dark brown in color. It is labeled as coming from the Imilchil area. Good size and aesthetics.

Size: 6 x 4.5 x 3.7 cm.
Main crystal: 2.9 cm.

Col J. Viñals. Col. E. Nicolau (Barcelona).

Excellent specimen of fluorapophyllite-(K) with very good size crystals that show the shapes of the tetragonal prism with faces of the dipyramid truncated by the basal pinacoid. Very good transparency, brilliance and definition. It is disposed very aerial on a matrix with stilbite. With handwritten label by Joan Viñals.

Size: 7 x 4.7 x 3 cm
Main crystal: 5.1 cm.

Good size garnet crystal belonging to the almandine-spessartine series, usually with a predominance of the first one. The analyzes indicate the presence of Fe and Mn, with traces of Mg. These specimens were identified as pyrope (magnesium aluminosilicate), but the analytical results do not indicate this.

Size: 5.1 x 3.4 x 2.7 cm.
Main crystal: 2 cm.

Group of garnet crystals belonging to the almandine-spessartine series, usually with a predominance of the first one. The analyzes indicate the presence of Fe and Mn, with traces of Mg. These specimens were identified as pyrope (magnesium aluminosilicate), but the analytical results do not indicate this.

Size: 5 x 3.7 x 3 cm.
Main crystal: 2 cm.

Group of garnet crystals belonging to the almandine-spessartine series, usually with a predominance of the first one. The analyzes indicate the presence of Fe and Mn, with traces of Mg. These specimens were identified as pyrope (magnesium aluminosilicate), but the analytical results do not indicate this.

Size: 3.3 x 2.9 x 2.2 cm.
Main crystal: 2,1 cm.

Group of geocronite-jordanite crystals, with striated pseudohexagonal shapes. They have a lighter gray sheen than the galena with which they are often associated. The analyzes show a correlation between geocronite-jordanite, both are isostructural and form series. The crystals analyzed (both these that we present and others) show that the composition moves in the intermediate zone of the series. Therefore, the correct thing would be to label these specimens as geocronite-jordanite, avoiding saying that they are only geochronite. We will send all analyzes to the buyer.
The geocronite-jordanite crystals are accompanied by crystals of sphalerite, of galena, associated with transparent crystals of green fluorite, both cubo-octahedral, the latter truncated by the faces of the cube and the trapezohedron.

Size: 5.5 x 4.1 x 3.5 cm.
Main crystal: 8 mm.
Found in 2022.

Analyzed specimen with report

Group of geocronite-jordanite crystals, with striated pseudohexagonal forms. They have a lighter gray luster than the galena with which they are often associated. The analyzes show a correlation between geochronite-jordanite, both are isostructural and form series. The crystals analyzed (both these that we present and others) show that the composition is in the intermediate zone of the series. Therefore, the correct way is to label these specimens as geocronite-jordanite, avoiding saying that they are only geochronite. We will send all analytical reports to the buyer.
The geocronite-jordanite crystals are found on a matrix formed by complex sphalerite crystals, almost black in color, associated with transparent green fluorite crystals, octahedral cubes, truncated by the cube and trapezohedron faces.

Size: 4.2 x 2.7 x 1.7 cm.
Main crystal: 8 mm.
Found in 2023.

Analyzed specimen with report

Small silver skeletal aggregates, golden to bronze in color, shiny, and emerging from a mass of native arsenic. This specimen has not been acidified like many specimens we see on the market.
Shaft 371 is the main shaft of the former Aue Mining Company (formerly Object 09) of SDAG Wismut, a uranium mine in the Westerzgebirge. With a total depth of more than 1,800 m, the mine was the deepest mine in Germany until its closure (mindat).

Size: 5.3 x 4.8 x 3.2 cm.

Brilliant aggregates of small safflorite crystals, accompanied by nickelskutterudite. We can see small proustite crystals with a magnifying glass, along with cobalt and nickel arsenates. A specimen from a classic locality.
Shaft 371 is the main shaft of the former Aue Mining Company (formerly Object 09) of SDAG Wismut, a uranium mine in the Westerzgebirge. With a total depth of more than 1,800 m, the mine was the deepest mine in Germany until its closure (mindat). These type of specimens, although they are not "aesthetic", have an essential systematic and historical interest. For lovers of "gray minerals", like myself...

Size: 6.6 x 6.4 x 4 cm.

A weighty, lustrous, polished, vein slice of massive breithauptite, with orange-brown nickeline. SEM-EDS has shown the presence of cobaltite, skutterudite and silver. This silver contains mercury, probably eugenite or kongsbergite, not determined before in this famous mining Cobalt area of Ontario. This sample belongs from the J. Vilaseca collection (Barcelona). Really interesting because nowadays samples like this are quite unusual. We will send all analytical results to the buyer.

Size: 5.8 x 4.8 x 0.8 cm.

Col. J. Vilaseca (Barcelona).

This good-sized specimen stands out for its branched nickelin growths, with its characteristic bronze color and shine. We can observe crystals in some cavities. It is covered with small safflorite crystals with a gray metallic luster. It is very interesting to observe this substitution. We can also observe well-defined crystals of nickelskutterudite, partially coated with pink cobalt arsenates.
Shaft 371 is the main shaft of the former Aue Mining Company (formerly Object 09) of SDAG Wismut, a uranium mine in the Westerzgebirge. With a total depth of more than 1,800 m, the mine was the deepest mine in Germany until its closure (mindat). These type of specimens, although they are not "aesthetic", have an essential systematic and historical interest. For lovers of "gray minerals", like myself...

Size: 8.8 x 6.4 x 3.4 cm.

Polished specimen where we can perfectly observe the turquoise veins in a brecchia. The colour is very intense. With some pyrite in matrix. The Meiduk porphyry is one of the most important copper mineral deposits of this country. In Iran, turquoise is called "Ferozah", which translated means "victory." It is Iran's national gemstone.

Size: 5 x 4.5 x 1.7 cm.
Found in 2023.

Group of interpenetrated pyrite crystals with an exceptional luster. This specimen stands out for its complex crystallography, with cube shapes, triglyphic striations, and vertices rich in probably trapezohedral faces. A piece to enjoy in its study, the kind that I like...

Size: 4.8 x 4.2 x 3.8 cm.
Main crystal: 3 x 2.9 cm.
Found in 2023.

Group of cube octahedral pyrite crystals forming a very aesthetic and brilliant aggregate.

Size: 4.8 x 3.9 x 3.2 cm.
Main crystal: 19 mm.
Found in 2023.

Group of pyrite crystals that show well defined faces of the cube and the octahedron. Very well defined faces and edges, showing triglyphic striations on the faces of the cube and not on the octahedron, as is to be expected. With an exceptional luster. It is accompanied by quartz crystals.

Size: 11.8 x 8 x 5.5 cm.
Main crystal: 27 mm.
Found in 2023.

Group of pyrite crystals with cube and dodecahedron faces, with diploid forms, striated faces, certainly complex crystallography, which adds interest to the specimen. Crystals are interpenetrated. The brightness is exceptional, difficult to photograph. It is accompanied by quartz crystals.

Size: 10.5 x 7.5 x 6.2 cm.
Main crystal: 40 mm.
Found in 2023.

Rich group of octahedral pyrite crystals, with an exceptional luster. A good-sized, very aesthetic specimen, from this classic Peruvian mine.

Size: 12 x 8.2 x 5 cm.
Main crystal: 22 mm.
Found in 2023.