Rosell Minerales

In this specimen we can observe numerous prismatic crystals of hydroxylherderite, an unusual calcium and beryllium hydroxylphosphate, with a very uniform beige color, very well defined faces and edges and with twinning. They are disposed on a matrix formed by albite crystals. The specimen is from the Piauí Valley, an area very rich in lithium-bearing pegmatites.

Size: 6.4 x 4.7 x 3.9 cm.
Main crystal: 1.4 cm.

These specimens of Peruvian arsenopyrite stand out for their excellent luster and perfection of its crystals. With the camera I am not able to capture its real beauty. On a sulfide matrix we can enjoy hundreds of arsenopyrite crystals, prismatic, with defined terminal faces, rather than well-defined. They're accompanied by chalcopyrite crystals with dull luster, but gold tone, also well-defined and twinned. Brilliance and quality. Good sized specimen.

Size: 11,5 x 5.7 x 4.4 cm.

These specimens of Peruvian arsenopyrite stand out for their excellent luster and perfection of its crystals. With the camera I am not able to capture its real beauty. On a sulfide matrix we can enjoy hundreds of arsenopyrite crystals, prismatic, with defined terminal faces, rather than well-defined. They're accompanied by chalcopyrite crystals with luster and gold color, also well-defined and twinned. Brilliance and quality.

Size: 6.1 x 5.6 x 2.7 cm.

Very esthetic miniature formed by a group of quartz crystals covered by beveled cubic pyrite on which various tabular crystals of hübnerite stand out, well defined and with a very visible red transparence. Specimen from the Joan Astor collection, acquired in 1982 from Bailey Minerals (Ángel Jesús Talabán García, Segovia 1942-Madrid 2007).

Size: 3.5 x 2.8 x 2.7 cm.
Main crystal: 9 mm.
Found in ±1982.

Col. Joan Astor (Barcelona).

Druse of pyrite crystals with faces of the cube and rhobododecahedron, striated faces, complex crystallography, which adds interest to the specimen. Back side is curiously flat. The luster is exceptional, not easy to take photos. The crystals are interpenetrated. A classic from the mine from which the bases for the FIFA football award "Ballon d'Or" are obtained...

Size: 6.5 x 5 x 3.2 cm.

Prismatic crystal of elbaite, with an intense green color, which shows a lighter green color on the upper flat face of the pinacoid when light passes through it. It is accompanied by clevelandite crystals. It comes from the Trigo collection.

Size: 2.3 x 2.2 x 1.9 cm.
Main crystal: 2 x 1.5 cm.

Col. Trigo (Mataró, Catalunya)

Elbaite specimen of very good size and thickness, showing us the prisms with vertical striations and well-defined terminal faces. Highlights the brightness and a more intense green color at the top and lighter at the base. A gem from Minas Gerais. It belongs from the Trigo collection.

Size: 4.9 x 2.3 x 2.2 cm.
Found in ±1985.

Col. Trigo (Mataró, Catalunya)

Specimens of magnetite from Cerro Huañaquino were well known decades ago, but today it is not easy to find them, and even less with the quality of this specimen that we propose. It is a druse of very bright octahedral crystals with an intense black colour that are disposed on the rocky matrix.

Size: 8.9 x 5 x 3.5 cm.
Main crystal: 7 mm.

Specimens of magnetite from Cerro Huañaquino were well known decades ago, but today it is not easy to find them, and even less with the quality of this specimen that we propose. It is a druse of very bright octahedral crystals with an intense black colour that are disposed on the rocky matrix.

 

Size: 7.8 x 6.8 x 2.8 cm.
Main crystal: 1.5 cm.

Very curious specimen of agate from this classic Argentine locality that shows us the characteristic botryoidal shapes that have been slightly polished to show us the beauty of this semiprecious stone. This specimen belongs from the Trigo collection (Mataró) and was acquired at the Mineralexpo Barcelona-Sants mineral show, in Barcelona, decades ago.

Size: 5.2 x 4.8 x 2.3 cm.
Found in ±2007.

Col. Trigo (Mataró, Catalunya)

Some almandine garnet crystals exposed in the center of a quartz nodule from an unusual alluvial deposit. The garnet crystals are nicely exposed showing almost half the largest crystal.

Size: 4.7 x 4 x 2.9 cm.
Main crystal: 2.8 cm.
Found in ±1985.

Col. Manchion (Barcelona).

A classic specimen from this Brazilian locality. Various flattened, almost lenticular, siderite crystals with a yellowish green color, on which a group of dolomite crystals stands out. In dolomite we see numerous pseudohexagonal pyrrhotite crystals, some included in the dolomite. We did not observe the presence of cubanite.

Size: 5.5 x 3.8 x 2.4 cm.
Found in ±1985.

Col. Manchion (Barcelona).

Numerous well-defined and interpenetrated sphalerite crystals are arranged on a matrix with quartz crystals, accompanied by pyrite crystals. In the upper part, a group of chalcopyrite crystals with some indentation, which allows us to see the color and brilliance.

Size: 6 x 4.4 x 4.3 cm.
Main crystal: 1.6 cm.
Found in ±1984.

Col. Manchion (Barcelona).

This old piece stands out for the size of the crystals and their color. The largest crystal presents the classic fractures, perpendicular to the main axis. The minor, with the terminal face. They are pieces that came out many years ago, around the 70s. This specimen also stands out for the label of Joan Montplet, a well-known mineral seller from Sant Celoni (Catalonia).

Size: 6.4 x 5.4 x 4.7 cm.
Main crystal: 4 x 1 cm.
Found in ±1970.

Col. Joan Astor (Barcelona). Adq. Joan Montplet (Sant Celoni).

Group of chalcopyrite crystals, bright, interpenetrated, with well defined edges. On the faces of the crystals we can see small aggregates of crystals, probably tetrahedrite. They are accompanied by sphalerite crystals on matrix. An old piece, from the time of those that are preserved in the Freiberg Mining School Museum.

Size: 6 x 4.8 x 2.2 xm.
Main crystal: 1.7 cm.
Found in ±1985.

Col. Manchion (Barcelona).

Group of cyclically twinned bournonite crystals, with a metallic gray color, interpenetrating each other. They are disposed on a matrix of very brilliant octahedral pyrite, partially covered by complex sphalerite crystals.

Size: 6 x 4.5 x 3.8 cm.

Group of octahedral pyrite crystals, very brilliant and well defined, which are accompanied by complex crystals of sphalerite. On them we observed numerous white globular crandallite aggregates (analyzed by XRD). This combination of minerals is unusual in the deposit, with this phosphate being the first citation.

Size: 5.5 x 5.3 x 2.7 cm.

Group of octahedral pyrite crystals, very brilliant and well defined, which are accompanied by complex crystals of sphalerite. On them we observed numerous white globular crandallite aggregates (analyzed by XRD). This combination of minerals is unusual in the deposit, with this phosphate being the first citation.

Size: 8.4 x 6.9 x 5 cm.
Main crystal: 18 mm. py

Druse of pyrite crystals with faces of the cube and rhobododecahedron, with diploid forms, striated faces, complex crystallography, which adds interest to the specimen. The luster is exceptional, not easy to take photos. The crystals are interpenetrated. A classic from the mine from which the bases for the FIFA football award "Ballon d'Or" are obtained...

Size: 9.2 x 6.8 x 4.6 cm.

Good size and rich aggregate of andradite-grosularia crystals with an intense brown color on the surface, but with color zoning, clearer inside. The exterior of the sample shows a dark reddish-brown tone with very well defined trapezohedral crystals, but inside the crystals have a very aesthetic golden tone. Multi-layered bands ranging from reddish brown to green to gold are shown in the fracture zones of the piece. For this reason we prefer to label it as the andradite-grossular series.

Size: 11 x 9.5 x 4.5 cm.
Main crystal: 15 mm.
Found in 2020.

Very good sized specimen of rhodochrosite from this classic Argentine locality. In the polished part we can enjoy the characteristic bands, with good color. And the "natural" part tells us that it belongs from a vein. It has a handwritten label attached on the sample and due to its appearance it was a very old piece.

Size: 9.5 x 6 c 4.5 cm
Found in ±1950.

Classic locality

Very aesthetic specimen that shows two generations of orpiment. One with an intense orange color, formed by numerous brilliant crystals. A second generation formed by crystals that cover the arsenopyrite-pyrite matrix, with a darker tone. A different sample from this classic Peruvian mine.

Size: 8 x 6.3 x 3.8 cm.

Floater crystal of columbite-(Fe), with a huge size for the species. We can observe numerous facets, some with striations, with brilliance. The specimen indicates "repaired" since a part (see photo) has been repositioned in its place, without affecting the quality. It is accompanied by minor lepidolite. Columbite specimens of this size are not common. We have analyzed the specimen and, in the attached diagram, we can see the results which indicate sample is in the columbite-(Fe) domain. Minor traces of Ti are present. We will send this results to the buyer. An exceptional piece.

Size: 8.6 x 6.2 x 3.5 cm.
Found in ±1970.

Col. F. Schweiger (Wien).
Analyzed specimen with report

Very rich group of sharp chalcocite crystals, some isolated and other interpenetrated, tabular and with very clear twinned pseudohexagonal forms. Intense metallic luster, gray color. They stand out on a matrix of bright calcite and small tennantite crystals. The specimens of this locality are very rare. Novelty in Sainte-Marie-aux-Mines 2017. The Mantos Cobrizos mine is a type of "mantle" deposit. This is a small Cu deposit, located in the mining district of Los Cóndores, close to Paipote, Copiapó. So far the production has been made a small scale.

Size: 7.2 x 6.6 x 3.7 cm.

Esthetic specimen formed by groups of lepidolite mica, bright and defined, on which we observe see a brilliant topaz crystal, slightly bluish and faceted, with excellent transparency. Uncommon on matrix. With old handwritten label.

Size: 5 x 4.5 x 3 cm.
Main crystal: 10 mm. top.
Found in ±1990.

Col. H.G. Hopper.