Rosell Minerales
RM3099 Doubly terminated quartz with sphalerite
Huayllapon mine, Pasto Bueno, Pallasca, Ancash, PerúRich group of quartz crystals, translucent to hyaline, and with the terminal faces of the rhombohedron different from the usual ones. Among them, a very good size doubly terminated crystal stands out, well defined and with the faces of the prism with striations perpendicular to the main axis. They are disposed on a matrix with quartz and sphalerite crystals.
Size: 11.7 x 8 x 7.4 cm.
Main crystal: 10.9 x 1.5 cm.
RM3062 Tapiolite-(Fe)
Quixaba pegmatite, Quixaba, Frei Martinho, Paraíba, BrazilIn this specimen we can observe an idiomorphic good size crystal of tapiolite-(Fe) that shows us different tetragonal faces. Good luster, intense black colour with iridescence on faces. It stands out on a matrix with albite and muscovite. The analyzes carried out indicate the presence of niobium in small proportions. These results will be sent to the buyer of the specimen.
Size: 5.5 x 5.3 x 3.8 cm.
Main crystal: 13 mm.

RM3035 Tapiolite-(Fe)
Quixaba pegmatite, Quixaba, Frei Martinho, Paraíba, BrazilIn this specimen we can observe interpenetrated tapiolite-(Fe) crystals showing different facets. Good luster, intense black color with iridescence on the faces. It stands out on a matrix with muscovite and albite crystals. The analyzes carried out indicate the presence of niobium in small proportions. These results will be sent to the buyer of the specimen.
Size: 5.2 x 4.3 x 3 cm.
Main crystal: 5 mm.
Analyzed specimen with report

RM3033 Augelite with pyrite, baryte and quartz
Tazna Mine, Cerro Tazna, Nor Chichas, Potosí, BoliviaIn this specimen we can observe a large group of augelite crystals, very brilliant, transparent and with very well defined faces and edges. Under magnification we can see that these crystals are richly faceted and have a pseudorhomboidal shape. They are accompanied on the matrix by small white prismatic crystals of baryte, along with numerous octahedral pyrite crystals. This specimen belongs from the Laskowski collection and is accompanied by various labels.
Size: 6.7 x 5.7 x 2.6 cm.
Main crystal: 5 mm.
Col. Erich Laskowski.

RM3001 Hydroxilherderite with albite
Valle de Piauí, Taquaral, Itinga, Minas Gerais, BrazilIn 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.
RM2992 Arsenopyrite and chalcopyrite
Julcani Mine, Julcani, Angaraes, Huancavelica, PerúThese 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.
RM2991 Arsenopyrite and chalcopyrite
Julcani Mine, Julcani, Angaraes, Huancavelica, PerúThese 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.
RM2947 Hübnerite, pyrite, and quartz
Julcani, Angaraes, Huancavelica, PerúVery 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).

RM2946 Pyrite
Quiruvilca Mine, Quiruvilca, Santiago de Chuco, La Libertad, PerúDruse 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.
RM2941 Elbaite and clevelandite
Lavra da Pederneira, São José da Safira, Doce valley, Minas Gerais, BrazilPrismatic 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)
RM2940 Elbaite
Cruzeiro mine, São José da Safira, Minas Gerais, BrazilElbaite 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)
RM2929 Magnetite
Huayriquiña mine, Cerro Huañaquino, Potosí, BoliviaSpecimens 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.
RM2928 Magnetite
Huayriquiña mine, Cerro Huañaquino, Potosí, BoliviaSpecimens 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.
RM2927 Agate, variety of Chalcedony
Las Plumas, Mártires, Chubut, ArgentinaVery 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)

RM2883 Almandine
Serrote Redondo, Pedra Lavrada, Paraíba, BrazilSome 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).

RM2867 Siderite with pyrrhotite and dolomite
Mina Morro Velho, Nova Lima, Minas Gerais, BrazilA 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).

RM2866 Sphalerite, Chalcopyrite, Pyrite and quartz
Huaron mines, Huayllay, Pasco, PerúNumerous 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).

RM2864 Tourmaline, var. Rubellite with lepidolite and quartz
Conselheiro Pena, Minas Gerais, BrazilThis 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).

RM2862 Chalcopyrite, Sphalerite and Quartz
Casapalca Mine, Casapalca, Huarochiri, Lima, PerúGroup 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).

RM2838 Bournonite, pyrite, sphalerite and quartz
Quiruvilca Mine, Quiruvilca, Santiago de Chuco, La Libertad, PerúGroup 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.
RM2841 Pyrite, sphalerite and crandallite
Quiruvilca Mine, Quiruvilca, Santiago de Chuco, La Libertad, PerúGroup 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.
RM2839 Pyrite, sphalerite and crandallite
Quiruvilca Mine, Quiruvilca, Santiago de Chuco, La Libertad, PerúGroup 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
RM2840 Pyrite
Quiruvilca Mine, Quiruvilca, Santiago de Chuco, La Libertad, PerúDruse 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.
RM2832 Andradite-Grossular
Distrito de Pampa Blanca, Castrovirreyna, Huancavelica, PerúGood 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.
RM2829 Rhodochrosite
Capillitas mines, Capillitas, Andalgalá, Catamarca, ArgentinaVery 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

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