Rosell Minerales

Group of very acute scalenohedral calcite crystals, well defined and with a brown colour due to inclusions. Thanks to some of these crystals that show exfoliation, we can observe that it has been formed in the final stages of their growth. From the A. Trigo collection (Mataró).

Size: 6.6 x 4.5 x 4.2 cm.
Main crystal: 1.8 cm.
Found in ca. 1996.

Col. Antonio Trigo (Mataró).

Good size sample of the meteoric impact that took place aproximately 49,000 years ago in this remote area of Arizona. The impact crater stands out, where more than 30 tons of material have been collected since was discovered in 1891. It is a metallic, iron-nickel meteorite, classified as coarse octahedrite. Contains taenite (Fe, Ni) and mostly iron, kamacite variety (Fe, Ni). Weight: 23 grams.

Size: 3.3 x 27 x 1.2 cm. 23 g.
Found in ca. 1997.

Col. Antonio Trigo (Mataró).

An interesting piece has gone back into the old work at the classic Choix locality and is pulling out some first-class smithsonites of blue, lavender and pink. From the collection of A. Trigo (Mataró).

Size: 4 x 3.5 x 1.7 cm.
Found in ca. 1988.

Col. Antonio Trigo (Mataró).

Glendonite is the name given to the pseudomorphic calcite after ikaite. Ikaite, a hexahydrated calcium carbonate, was first observed in nature in the 1960s, at the seabed of the Ikka Fjord in Greenland. There, it precipitates due to the mixture of cold water submarine springs (3°C) rich in carbonates with seawater. Ikaite deposits are not usually found due to its poor stability, however, sometimes the rapid conversion of ikaite to calcite and water results in the generation of pseudomorphic calcite aggregates in the shape of the ikaite crystal (so-called glendonites). These calcite pseudomorphs directly replace ikaite above 4ºC.

Size: 6.1 x 2.2 x 1.7 cm.
Found in ca. 1995.

Col. Antonio Trigo (Mataró).

Good sized fluorite crystal from this classic North American mine. It shows the cube shape with staggered growths on one edge, along with polysynthetic growths on the faces. Translucent to transparent, bright and with a violet tone that shows geometric color zoning, more intense on the edges. With a minor "matrix" of sphalerite.

Size: 5 x 4.1 x 2.6 cm.
Main crystal: 4 cm edge/arista
Found in ca. 1988.

Col. Antonio Trigo (Mataró).
Fluorescent under long wave UV

Aesthetic specimen of calcite crystals that form this semi-globular aggregate, with luster. It is accompanied by a small matrix with quartz and chalcopyrite crystals. A classic from the Romanian mine of Boldut; from the A. Trigo collection (Mataró). It shows an intense fluorescence under LW-UV light.

Size: 5.5 x 5 x 2.9 cm.
Found in ca. 2005.

Col. Antonio Trigo (Mataró).
Fluorescent under long wave UV

Globular aggregates of prismatic natrolite crystals, with well defined terminal faces. It comes from a locality well known for its zeolites. Nowadays this Cape Grim area is restricted access due to wind turbines field. From the former A. Trigo Collection (Mataró).

Size: 6 x 5.5 x 2.6 cm.
Found in ca. 1985

Col. Antonio Trigo (Mataró)

Globular aggregate of prismatic natrolite crystals, with well defined terminal faces. It is disposed very aerially on the matrix. Specimens on matrix are unusual. It comes from a locality well known for its zeolites. Nowadays this Cape Grim area is restricted access due to wind turbines field. From the former J. Astor Collection (Barcelona).

Size: 3.5 x 3.2 x 2.8 cm.
Main crystal: 1.5 cm. aggr.
Found in ca. 1983.

Col. Joan Astor (Barcelona)

Group of cubic fluorite crystals, with good brilliance, transparence and a very characteristic green color. From this classic Moroccan mines. With the label of the former collection Trigo (Mataró).

Size: 4.7 x 3.5 x 2.7 cm.
Main crystal: 2.2 cm.

Fluorescent under long wave UV

These specimens of manganite partially replaced pyrolusite, come from a locality not yet described in the mineralogical bibliography. This deposit is located in the province of Boulemane, in the Fez-Meknés region, about ten kilometers from the well-known Aouli mines. It is a formation very similar to that of Imini (near Ouarzazate). These manganese deposits, both in Imini and in the Boulemane area, were formed in a karst system. Associated with shallow marine dolomites of the Cretaceous age and that currently form sub-horizontal mantles cutted by erosion, overlaping areas of volcanic rocks. Manganese minerals are found in dolomite breccia and ferruginous clays. We have carried out X-ray diffraction studies showing us the presence of both species: manganite and pyrolusite.

Size: 7.8 x 4 x 2.5 cm.
Main crystal: 3 cm.
Found in 03/2020

Analyzed specimen with report

These specimens of manganite partially replaced pyrolusite, come from a locality not yet described in the mineralogical bibliography. This deposit is located in the province of Boulemane, in the Fez-Meknés region, about ten kilometers from the well-known Aouli mines. It is a formation very similar to that of Imini (near Ouarzazate). These manganese deposits, both in Imini and in the Boulemane area, were formed in a karst system. Associated with shallow marine dolomites of the Cretaceous age and that currently form sub-horizontal mantles cutted by erosion, overlaping areas of volcanic rocks. Manganese minerals are found in dolomite breccia and ferruginous clays. We have carried out X-ray diffraction studies showing us the presence of both species: manganite and pyrolusite.

Size: 6.3 x 2.5 x 2.4 cm.
Main crystal: 1.2 cm.
Found in 03/2020

Analyzed specimen with report

These specimens of manganite partially replaced pyrolusite, come from a locality not yet described in the mineralogical bibliography. This deposit is located in the province of Boulemane, in the Fez-Meknés region, about ten kilometers from the well-known Aouli mines. It is a formation very similar to that of Imini (near Ouarzazate). These manganese deposits, both in Imini and in the Boulemane area, were formed in a karst system. Associated with shallow marine dolomites of the Cretaceous age and that currently form sub-horizontal mantles cutted by erosion, overlaping areas of volcanic rocks. Manganese minerals are found in dolomite breccia and ferruginous clays. We have carried out X-ray diffraction studies showing us the presence of both species: manganite and pyrolusite.

Size: 7 x 4 x 3 cm.
Main crystal: 1.8 cm.
Found in 03/2020

Analyzed specimen with report

These specimens of manganite partially replaced pyrolusite, come from a locality not yet described in the mineralogical bibliography. This deposit is located in the province of Boulemane, in the Fez-Meknés region, about ten kilometers from the well-known Aouli mines. It is a formation very similar to that of Imini (near Ouarzazate). These manganese deposits, both in Imini and in the Boulemane area, were formed in a karst system. Associated with shallow marine dolomites of the Cretaceous age and that currently form sub-horizontal mantles cutted by erosion, overlaping areas of volcanic rocks. Manganese minerals are found in dolomite breccia and ferruginous clays. We have carried out X-ray diffraction studies showing us the presence of both species: manganite and pyrolusite.

Size: 8.4 x 5 x 3.5 cm.
Main crystal: 3.3 cm.
Found in 03/2020

Analyzed specimen with report

These specimens of manganite partially replaced pyrolusite, come from a locality not yet described in the mineralogical bibliography. This deposit is located in the province of Boulemane, in the Fez-Meknés region, about ten kilometers from the well-known Aouli mines. It is a formation very similar to that of Imini (near Ouarzazate). These manganese deposits, both in Imini and in the Boulemane area, were formed in a karst system. Associated with shallow marine dolomites of the Cretaceous age and that currently form sub-horizontal mantles cutted by erosion, overlaping areas of volcanic rocks. Manganese minerals are found in dolomite breccia and ferruginous clays. We have carried out X-ray diffraction studies showing us the presence of both species: manganite and pyrolusite.

Size: 5.3 x 4.5 x 2.7 cm.
Main crystal: 1.5 cm.
Found in 03/2020

Analyzed specimen with report

Two interpenetrating zunyite crystals, one of them dominant. Its color is due to hematite inclusions. With the shape of a tetrahedron truncated by the faces of the cube. The edge of the tetrahedron measures 12 mm. An interesting specimen for systematic collectors and crystallography lovers. A rare species, it is an aluminum sorosilicate with fluorine and chlorine. We carried out an X-ray diffraction and fluorescence studies that confirmed the species. We recommend an interesting article about the deposit in the magazine Rocks and Minerals (Vol. 95, nº 2, 2020).

Size: 1.2 x 1.1 x 1.1 cm.
Main crystal: 12 mm edge/arista.

Analyzed specimen with report

A floating zunyite crystal. Its color is due to hematite inclusions. With the shape of a tetrahedron truncated by the faces of the cube. The edge of the tetrahedron measures 13 mm. An interesting specimen for systematic collectors and crystallography lovers. A rare species, it is an aluminum sorosilicate with fluorine and chlorine. We carried out an X-ray diffraction and fluorescence studies that confirmed the species. We recommend an interesting article about the deposit in the magazine Rocks and Minerals (Vol. 95, nº 2, 2020).

Size: 1.2 1.1 x 1 cm.
Main crystal: 12 mm edge/arista.

Analyzed specimen with report

Two interpenetrating zunyite crystals, one of them dominant. Its color is due to hematite inclusions. With the shape of a tetrahedron truncated by the faces of the cube. The edge of the tetrahedron measures 11 mm. The small one has a nick in one vertex. An interesting specimen for systematic collectors and crystallography lovers. A rare species, it is an aluminum sorosilicate with fluorine and chlorine. We carried out an X-ray diffraction and fluorescence studies that confirmed the species. We recommend an interesting article about the deposit in the magazine Rocks and Minerals (Vol. 95, nº 2, 2020).

Size: 1.2 x 1 x 1 cm.
Main crystal: 10 mm. edge/arista

Analyzed specimen with report

Two interpenetrating zunyite crystals, one of them dominant. Its color is due to hematite inclusions. With the shape of a tetrahedron truncated by the faces of the cube. The edge of the tetrahedron measures 11 mm. An interesting specimen for systematic collectors and crystallography lovers. A rare species, it is an aluminum sorosilicate with fluorine and chlorine. We carried out an X-ray diffraction and fluorescence studies that confirmed the species. We recommend an interesting article about the deposit in the magazine Rocks and Minerals (Vol. 95, nº 2, 2020).

Size: 11 x 10 x 10 mm.
Main crystal: 10 mm. edge/arista

Analyzed specimen with report

Very sharp single zunyite crystal with good luster, coloured by red hematite inclusions and with some small brilliant foliaceous hematite partially included in faces. On a minor matrix. Clean tetrahedron form, truncated by cubic faces. Tetrahedron edge is 12 mm. A good sized and nice crystallographic specimen of this unusual species, a rare sorosilicate of aluminum and chlorine, with fluorine. Analized by X-ray difraction and X-ray fluorescence.

Size: 1.7 x 1.3 x 1.3 cm.
Main crystal: 12 mm edge.

Analyzed specimen with report

Group of zunyite crystals on matrix, interpenetrated, brilliant and with cube faces truncating the edges of the tetrahedron. Its intense color is due to hematite inclusions. The edge of the major tetrahedron is 12 mm. A good size crystallographic specimen of this mineral species, a rare aluminum chlorine sorosilicate with fluorine. Analyzed by fluorescence and X-ray diffraction.

Size: 2.6 x 1.5 x 1.2 cm.
Main crystal: 12 mm edge.

Analyzed specimen with report

Very well defined zunyite crystals, with luster and on matrix. The intense tile colour is due to hematite inclusions. With clean tetrahedron shape, truncated by cube faces. The edge of both tetrahedrons measures 8 mm. They are included in a small matrix of hematite. A crystallographic specimen of this mineral species, a rare aluminum chlorine sorosilicate with fluorine. We performed some X-ray diffraction studies that confirmed the species. We recommend an interesting article about this Iranian deposit in the magazine Rocks and Minerals (Vol. 95, nº 2, 2020).

Size: 3.8 x 2.7 x 1 cm.
Main crystal: 8 mm edge.

Analyzed specimen with report

Very well defined zunyite crystal, with luster and on matrix. Its intense colour is due to hematite inclusions. With very clean tetrahedron shape, truncated by cube faces. The edge of the tetrahedron measures 8 mm. It is included in a matrix of hematite. A crystallographic specimen of this mineral species, a rare aluminum chlorine sorosilicate with fluorine. We performed some X-ray diffraction studies that confirmed the species. We recommend an interesting article about this Iranian deposit in the magazine Rocks and Minerals (Vol. 95, nº 2, 2020).

Size: 5.5 x 5.2 x 4 cm.
Main crystal: 8 mm edge.

Analyzed specimen with report

Various complex cinnabar crystals, some with a cyclic twin, one of them clearly dominant. Excellent luster and intense red color, stand out on the quartz matrix from which the calcite has been removed. This mine was worked until the early 1970s. A Spanish classic that is not easy to find in the market.

Size: 6.6 x 3.2 x 1.8 cm.
Main crystal: 6 mm.

Group of fan-shaped prismatic epidote crystals, brilliant and with an intense green color. These specimens come from a not well-known quarry, close to Medina de Pomar, in Burgos, from a quarry where the ofites have been mined by the company Minera Ofitas del Norte.

Size: 8.5 x 4.4 x 3.8 cm.
Main crystal: 1 cm.

Rich group of fan-shaped prismatic epidote crystals, brilliant and with an intense green color. These specimens come from a not well-known quarry, close to Medina de Pomar, in Burgos, from a quarry where the ofites have been mined by the company Minera Ofitas del Norte.

Size: 9.1 x 7.5 x 3.2 cm.
Main crystal: 1.2 cm.