Rosell Minerales

Specimens of fettelite, a complex silver-mercury sulfoarsenide, are very rare and even less so at this size. Under magnification we can observe burgundy red laminar crystals of fettelite, together with idiomorphic crystals of proustite. An exceptional piece.

Size: 9 x 5.2 x 4 cm.

Type Locality

Rübenkeller is the famous historical locality for chabazite and phillipsite from about 1850 and was very prolific in zeolite specimens in the late 19th century. In this specimen, from the Freiburg Bergakademie, we can see various aggregates of very well defined, pseudocubic, transparent and very bright crystals, which fill the vacuoles of the volcanic rock. It is accompanied by a very interesting old handwritten label.

Size: 5.6 x 4.4 x 2.7 cm.
Main crystal: 3 mm.
Found in ±1880.

Freiberg Bergakademie

Group of barite crystals, of good size, well defined and richly faceted, transparent to translucent and with a honeyed hue. They are disposed in a very aerial way on a matrix with fluorite and quartz.

Size: 7.6 x 4 x 3.5 cm.
Main crystal: 2.3 cm.
Found in ±1990.

Group of very good size baryte crystals, well-defined faces and edges, transparent to translucent, with inclusions of pyrolusite and quartz.

Size: 5 x 3.8 x 2.8 cm.
Main crystal: 3.6 cm.
Found in ±1990.

Classic locality

An azurite specimen from this classic German locality, to be enjoyed under magnification. These are aggregates of azurite crystals, some isolated, richly faceted, with transparence, brilliance and the characteristic colour. With globular aggregates of malachite. Very aesthetic.

Size: 4.8 x 4 x 3.8 cm.
Main crystal: 4 mm. agreg.

Classic locality

The silver specimens from this classic German mine has been known for a long time, but in these specimens silver is included in chrysocolla, of an intense greenish blue colour, and shows a remarkable luster, sometimes with golden iridescence. Under magnification we can see facets of crystals of this metal. We have analyzed these samples and the results indicate that they do not contain other metals detectable by SEM-EDS. These specimens are already a few years old.

Size: 6.2 x 4 x 3 cm.

Analyzed specimen with report

The silver specimens from this classic German mine has been known for a long time, but in these specimens silver is included in chrysocolla, of an intense greenish blue colour, and shows a remarkable luster, sometimes with golden iridescence. Under magnification we can see facets of crystals of this metal. We have analyzed these samples and the results indicate that they do not contain other metals detectable by SEM-EDS. These specimens are already a few years old.

Size: 6.1 x 4.8 x 2.1 cm.
Found in ±1995.

Analyzed specimen with report

Grube Clara baryte specimens are a classic for the species in Europe. In this specimen we can enjoy numerous crystal aggregates, some isolated, presenting a rich complexity of facets. They are mainly formed by faces of orthorhombic prisms and curiously some are translucent while others are totally transparent. The brilliance, transparence and contrast on the matrix add aesthetics to this specimen.

Size: 7 x 4.4 x 2.5 cm.
Main crystal: 7 mm.
Found in ±2020.

Classic locality

A novelty from Sainte-Marie-aux-Mines 2022. These specimens come from a recent find in this mining area of the Black Forest and are reminiscent of those found decades ago in this area. They show radial aggregates of extremely brilliant pyrolusite crystals that partially replace manganite. By X-ray diffraction we have been determined the presence of both species, even with a certain predominance of manganite. They usually appear on a matrix of pink granite or as groups of large crystals in parallel growth. In the specimens we can observe the inclined flattened terminal faces. They are highly aesthetic pieces those will become part of the best specimens of these species for European mineralogy. We will send the XRD to the buyer.

Size: 8.8 x 7.4 x 5.2 cm.
Main crystal: 4.2 cm.
Found in 2021.

Analyzed specimen with report

A novelty from Sainte-Marie-aux-Mines 2022. These specimens come from a recent find in this mining area of the Black Forest and are reminiscent of those found decades ago in this area. They show radial aggregates of extremely brilliant pyrolusite crystals that partially replace manganite. By X-ray diffraction we have been determined the presence of both species, even with a certain predominance of manganite. They usually appear on a matrix of pink granite or as groups of large crystals in parallel growth. In the specimens we can observe the inclined flattened terminal faces. They are highly aesthetic pieces those will become part of the best specimens of these species for European mineralogy. We will send the XRD to the buyer.

Size: 6.7 x 5.5 x 4.1 cm.
Found in 2021.

Analyzed specimen with report

A novelty from Sainte-Marie-aux-Mines 2022. These specimens come from a recent find in this mining area of the Black Forest and are reminiscent of those found decades ago in this area. They show radial aggregates of extremely brilliant pyrolusite crystals that partially replace manganite. By X-ray diffraction we have been determined the presence of both species, even with a certain predominance of manganite. They usually appear on a matrix of pink granite or as groups of large crystals in parallel growth. In the specimens we can observe the inclined flattened terminal faces. They are highly aesthetic pieces those will become part of the best specimens of these species for European mineralogy. We will send the XRD to the buyer.

Size: 9 x 5.8 x 3.8 cm.
Main crystal: 3 cm. rad.
Found in 2021.

Analyzed specimen with report

A novelty from Sainte-Marie-aux-Mines 2022. These specimens come from a recent find in this mining area of the Black Forest and are reminiscent of those found decades ago in this area. They show radial aggregates of extremely brilliant pyrolusite crystals that partially replace manganite. By X-ray diffraction we have been determined the presence of both species, even with a certain predominance of manganite. They usually appear on a matrix of pink granite or as groups of large crystals in parallel growth. In the specimens we can observe the inclined flattened terminal faces. They are highly aesthetic pieces those will become part of the best specimens of these species for European mineralogy. We will send the XRD to the buyer.

Size: 7.4 x 5.4 x 3.2 cm.
Main crystal: 4.7 cm.
Found in 2021.

Analyzed specimen with report

A novelty from Sainte-Marie-aux-Mines 2022. These specimens come from a recent find in this mining area of the Black Forest and are reminiscent of those found decades ago in this area. They show radial aggregates of extremely brilliant pyrolusite crystals that partially replace manganite. By X-ray diffraction we have been determined the presence of both species, even with a certain predominance of manganite. They usually appear on a matrix of pink granite or as groups of large crystals in parallel growth. In the specimens we can observe the inclined flattened terminal faces. They are highly aesthetic pieces those will become part of the best specimens of these species for European mineralogy. We will send the XRD to the buyer.

Size: 7.2 x 7 x 4.1 cm.
Main crystal: 2.7 cm.
Found in 2021.

Analyzed specimen with report

Aesthetic globular aggregate of thomsonite-Ca, with a slightly bony tone and disposed in a basalt vacuole lined with small phillipsite crystals. Arensberg phillipsite crystals contain both potassium and calcium, and in some crystals calcium is dominant. A very good specimen for this German locality, little represented in collections.

Size: 8.8 x 5.4 x 4.9 cm.
Main crystal: 13 mm. glob.
Found in ±1974.

Classic locality

This is another one of those specimens from old collections, as evidenced by the various accompanying labels, that contain discredited or dubious mineral names. Even so, the historical and scientific interest it presents has made us offer it.
In the piece we observe a core of galena with halos of alteration of the vein in the socket. In the cavities we find numerous well-formed crystals of cerussite. And in some areas we observe greenish and honeyed tones probably corresponding to pyromorphite, but also to possible scorodite. The 'ganomatite' is considered a scorodite with impurities, while the pitticite is a questionable species formed by amorphous hydrated iron arsenate. Although this last mineral is currently accepted, it is questioned.

Size: 5.4 x 4 x 3.9 cm.
Found in ±1977.

Col. Joan Astor (Barcelona).

This is one of the rare borates determined in Kohnstein quarry. The crystals, sharp and well defined, are completely transparent, colorless, large for the species and on matrix. It comes from this currently inactive quarry in the Harz mountains.

Size: 7 x 5 x 2 cm.
Found in 2014.

Very rich specimen formed by several hydroboracite crystals, with a very elongated prism and well-defined faces and edges. Totally colorless, transparent and with an extraordinary brightness. A piece of the best quality for the species. It belongs from a currently inactive quarry in the Harz mountains.

Size: 7.3 x 5.7 x 1.7 cm.
Main crystal: 10 mm.
Found in 2014.

Specimen rich in Co-ore on which various proustite crystals stand out. Very faceted and transparent, which allows us to see the red color of this silver sulfosalt. A photograph of this specimen, from Volker Betz, was image of the day in mindat (Photo of the Day - 7th Oct 2012). A very remarkable piece for this German mine.

Size: 5 x 4.8 x 3.4 cm.
Main crystal: 4 mm.

Ex. Volker Betz; Ex. Erich Laskowski col.

Very rich group of harmotome crystals filling a vacuole in the volcanic rocky matrix. Rich also in faces, with brilliance and between transparent like the smaller ones, and translucent the larger ones. Idar-Oberstein is known as a city of precious stones with traditional workshops those work agate, jasper, quartz, etc. A specimen of very good quality for this locality, nowadays difficult to find. With old label.

Size: 7.7 x 7.3 x 6.3 cm.
Main crystal: 7 mm.

Ex. Wein Col (Germany) and ex. Erich Laskowski col. (USA).

These German mines have produced some of the best specimens of silver and allargentum from European mines. A good-sized piece, we can see aggregates of this silver and antimony species showing rounded forms. Disposed very aerial on a calcite matrix. With good luster and bronze reflections. With safflorite. It belongs from a Spanish collection, and we will send the handwritten label to the buyer.

 

Size: 6.9 x 5.3 x 2.3 cm.

Col. M. Marí - A. García (Castelló)

Rich group of complex and brilliant chalcopyrite crystals contrasting on a matrix of barite crystals. They are accompanied by interpenetred rhombohedral dolomite crystals. The specimen belongs from the Dreislar mine, a mine that was operated from 1970 to 2007, with the usual interruptions, for lead, zinc and copper, and more modernly for baryte. The specimens are classics in German collections.

Size: 8.8 x 5.5 x 3.4 cm.
Main crystal: 7 mm.

Classic locality

A typical polished slice of 'Federpyrit' (variety "feather pyrite"), with a good size. This is a pseudomorphs of pyrite after thin tabular pyrrhotite. Classic specimen from Pfaffenberg, an ancient German lead-silver mine. With siderite. Very appreciated for European collectors.

Size: 12.2 x 6.3 x 2.6 cm.
Found in ±1970.

Col. H.G. Hoppert.

From a classic German locality: Alberoda bei Aue. This locality is known by its silver sulphosalts, but not well represented in collections. This good sized specimen is very rich in brilliant stephanite crystals and some reddish pyrargyrite.

Size: 5.8 x 5.6 x 4.5 cm.

Classic locality

Deep red eleonorite crystal aggregates with some delvauxite on limonite. Classic sample from Rotläufchen mine near Waldgirmes, Hesse, type locality for the species. Closely related to beraunite and forms by oxidation of the latter.

Size: 2.6 x 2 x 1.7 cm.

Classic locality

From this classic German locality, Grube Clara, we get this specimen formed by aggregates of acicular crystals of sellaite, an unusual magnesium fluoride.

Size: 2.5 x 2.3 x 1.4 cm.

Classic locality