Rosell Minerales

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.

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).

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 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.

In this specimen we can observe brilliant aggregates of brown transparent römerite crystals, a very rare iron sulphate. They are accompanied by coquimbite showing an intense violet color under fluorescent light or LED type. They're accompanied by yellow metavoltine/copiapite crystals, along with minor fibrous halotrichite. Note that under the magnifying glass we can navigate in a world of brilliant crystals, some of which of krausite species (yellowish to grey transparent). We left this identification pleasure to the collector. Regarding its environmental stability, this sample has been stored during more than eight years without further alteration.

Size: 6.1 x 5.5 x 4.6 cm.
Found in 03/2010.

Epidote crystal, dark olive green in colour, very bright, with defined terminations, striking lighter green reflections and many flashes of greenish-yellow internal fire. Excellent specimen of Peruvian epidote.

Size: 3.7 x 2.1 x 1.8 cm.
Found in 2019.

Good size epidote crystal, dark olive green in colour, very bright, with defined terminations, striking lighter green reflections and many flashes of greenish-yellow internal fire. Excellent specimen of Peruvian epidote.

Size: 4.8 x 2.8 x 2.6 cm.
Found in 2019.

On a rich group of rosettes of rhodochrosite, with a pinkish tone and a silky luster, there are various crystals of tetrahedrite, defined, brilliant and contrasting on the matrix.

Size: 6.7 x 5 x 3.2 cm.
Main crystal: 3 mm. Td
Found in ca. 1985.

Col. J. Astor (Barcelona).

Groups of aggregates of rhodochrosite crystals, of a delicate pink color, brilliant. They are accompanied by colorless aggregates of small quartz crystals. Very aesthetic.

Size: 5.6 x 4.1 x 2.2 cm.
Found in ca. 1988.

Col. Antonio Trigo (Mataró).

Group of rhodochrosite crystals with a uniform pink color, with well-defined rhombohedron echeloned and scalenohedron forms. Good gemmy transparence. They are accompanied by other smaller rhodo crystals. On a solid matrix with quartz crystals with inclusions and manganese oxides.

Size: 6.5 x 3.5 x 3.4 cm.
Main crystal: 6 mm.

Group of rhodochrosite crystals with a uniform pink color, with well-defined rhombohedron echeloned and scalenohedron forms. Good gemmy transparence. They are accompanied by other smaller rhodo crystals. On a solid matrix with quartz crystals with inclusions and manganese oxides.

Size: 4.8 x 3.2 x 3.2 cm.
Main crystal: 5 mm.

An old specimen of this Peruvian mine that shows a large group of cubic galena crystals, interpenetrated, with its characteristic gray tone. They have stepped growths on the faces and some natural cavities, which give them a differentiated appearance.

Size: 11 x 9 x 6 cm.
Main crystal: 2.0 cm.
Found in 11/1985.

#185 Col. Manchion (Barcelona).

Group of chalcopyrite crystals, one of good size, with defined shapes arranged on quartz hyaline crystals. An aesthetic miniature.

Size: 5.2 x 3.5 x 2.5 cm.
Main crystal: 1.6 cm.
Found in ±1987.

#360 Col. Manchion (Barcelona).

Very aesthetic specimen formed by numerous bournonite crystals, excellent luster, sharps and cyclically twinned. They are accompanied by cube octahedral galena crystals with rounded faces and edges and brilliant pyrite. Nice miniature.

Size: 4.5 x 3.6 x 2.4 cm.
Main crystal: 8 mm.
Found in 2019.

In a matrix formed by octahedral pyrite crystals, very bright and faceted, various groups of sphalerite crystals are disposed on which the bournonite cyclic twins stand out. They are accompanied by small quartz crystals and hydrozincite globules. A very aesthetic piece.

Size: 5.2 x 3.8 x 3.2 cm.
Main crystal: 6 mm.
Found in 2019.

Group of rhodochrosite crystals with a uniform pink color, with well-defined rhombohedron echeloned and scalenohedron forms. Good gemmy transparence. They are accompanied by other smaller rhodo crystals. On a solid matrix with quartz crystals with inclusions and manganese oxides.

Size: 4.8 x 4.6 x 4 cm.
Main crystal: 1 cm.

Group of rhodochrosite crystals that stand out for their color, with well-defined scalenohedron shapes and good transparence. Accompanied by other smaller rhodo crystals. On a matrix with manganese oxides, hyaline quartz crystals and some colorless fluorite.

Size: 5.0 x 3.3 x 3.2 cm.
Main crystal: 8 mm.