Rosell Minerales

Group of diopside crystals with an intense green color, parallel growths, brilliant and translucent. A specimen of this classic Spanish locality from the Peter Seroka collection.

Col. Peter Seroka, #430 (Girona).

Rich group of tabular semseyite crystals forming brilliant rosettes. It is accompanied on the matrix with galena, chalcopyrite, sphalerite and some quartz. Nowadays, these specimens are not easy to find.

Size: 10.8 x 8.5 x 3.7 cm.

Ex. Jordi Fabre #N23E.

Very good size specimen of celestine from this classic Spanish locality. In this specimen we can observe various botryoidal to stalactitic forms, one of them in the form of a bridge-curl, and which cover old celestine crystals, as evidenced by the rounded prismatic shapes.

Size: 14.2 x 12 x 5.7 cm.
Found in ±2006.

Specimens of bavenite from Cadalso de los Vidrios are a classic of Spanish mineralogy and pieces of this beryllium and calcium aluminosilicate had not been seen for quite some time. In this good-sized specimen formed by parallel growths of microcline crystals with albite, we can observe numerous rosette-shaped aggregates of tabular bavenite crystals, well defined, brilliant, and colorless to slightly yellowish. The specimen belongs to a North American collection.

Size: 12.1 x 9 x 5.8 cm.

Col. Erich Laskowski.
Classic locality

A very good size specimen formed by several vugs covered by rosettes of hureaulite crystals with a tabular shape. Crystals are transparent to translucent, well-defined and with a very characteristic light brown color. The matrix is formed by other phosphates such as rockbridgeite, almost black in color. Specimens of this quality and with this size are not easy to find. A museum piece.

Size: 10.6 x 10.5 x 5.8 cm.

This specimen from the Freiberg Bergakademie is accompanied by a very old label, probably from the early to mid-19th century, along with a more "modern" one. When in doubt about the description of the labels, we proceeded to analyze the specimen using SEM-EDS. By this spectroscopic technique we have been able to confirm that the beige crystals included in the piece are titanite. The white matrix corresponds to potassium feldspar, most likely microcline, and the black elongated prismatic crystals correspond to aegirine-augite. It is a historical specimen from a Norwegian locality known for centuries for mining magnetite in skarns. We will send all analyzes to the buyer.

Size: 7 x 6.1 x 3.9 cm.
Main crystal: 18 mm.
Found in s. XIX.

Freiberg Bergakademie.
Analyzed specimen with report

These specimens, although not remarkable for their great beauty, do present historical interest to many collectors. According to the old label that accompanies it, the place where it was collected indicates that it is the "pic d'Espada" (Sword peak) and in French territory. After several inquiries, we can place this peak in the Varètja area, in the French High Pyrenees, in Occitania, north of the Spanish border with the Ordesa y Monte Perdido National Park. We can observe numerous black dodecahedral crystals of andradite-grossular, melanite variety, which in the past were given the name "pyreneite". It is accompanied by the 19th century handwritten label of Dr. Hugo Francke (Dresden).

Size: 4 x 3.6 x 3.4 cm.
Found in ±1890.

Freiberg Bergakademie - Dr. Hugo Francke
Analyzed specimen with report

Specimen of hydromagnesite formed by various globular aggregates of lanceolated and transparent crystals of this magnesium hydroxylcarbonate. They stand out for their contrast with the ophiolitic rocky matrix. It is not very common to find specimens from this Italian locality.

Size: 5.7 x 4.4 x 3.4 cm.

This wulfenite specimen comes from the type locality for the species and it is not very common to find specimens from Bad Bleiberg. Wulfenite was precisely renamed in 1845 in honor of Franz Xaver von Wulfen (1728-1805), botanist, mineralogist, mountaineer and member of the Society of Jesus. Wulfen is the author of a monograph on the Bleiberg lead deposits (Austria). This specimen shows us a rich group of sharp dipyramidal crystals, with small tetragonal prism faces. Some of them have complex terminal faces. The orange color and the brilliance of the crystals make it stand out on the matrix. It is accompanied by the handwritten label of Dr. Joan Viñals and belongs to the Marí-García collection.

Size: 8 x 7.3 x 3.8 cm.
Main crystal: 4 mm.
Found in ±1999.

Col. Miquel Marí-Ana García (Castelló)
Type Locality

The chabazite-Ca specimens from this Italian locality present aggregates of orange lenticular crystals. The aesthetic is very remarkable when contrasting in the vacuoles of the basaltic matrix. They are accompanied by phillipsite, analcime, minerals from the smectite group, and calcite. Under magnification we can observe the vacuoles with the different minerals, an entertainment.

Size: 6.8 x 4.8 x 4.6 cm.
Main crystal: 6 mm glob.

The chabazite-Ca specimens from this Italian locality present aggregates of orange lenticular crystals. The aesthetic is very remarkable when contrasting in the vacuoles of the basaltic matrix. They are accompanied by phillipsite, analcime, minerals from the smectite group, and calcite. Under magnification we can observe the vacuoles with the different minerals, an entertainment.

Size: 7.8 x 6.2 x 5 cm.
Main crystal: 4 mm. glob.

Specimen upholstered by numerous libethenite crystals, they are accompanied by pseudomalachite. Under magnification we observe pseudooctahedral forms, with brightness and an intense green color. From this classic Portuguese locality.

Size: 5.1 x 4.8 x 3.3 cm.

Radiated spray aggregates of fine dawsonite crystals, a rare aluminum sodium hydroxylcarbonate. They aredisposed on a marl matrix. They come from a known area for the species but from a new find.

Size: 7 x 5 x 1.8 cm.
Found in 2021-22.

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 5.5 x 5.2 x 3.5 cm.
Found in ±1997.

Classic locality

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 4.8 x 4.5 x 2.3 cm.
Found in ±1997.

Classic locality

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 6.7 x 5.7 x 2.5 cm.
Found in ±1997.

Classic locality

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 6.4 x 4.8 x 3.7 cm.
Found in ±1997.

Classic locality

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 4.2 x 3.8 x 3.2 cm.
Found in ±1997.

Classic locality

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 3.8 x 3.5 x 2 cm.
Found in ±1997.

Classic locality

Dadsonite is a rare chloro-sulfoantimonide of lead, compositionally differing from boulangerite by this chlorine anion (1 atom of Cl for 60 atoms of S!). In the "bad-lands" area of Sant Ponç (or Saint-Pons) there are lenticular levels of siderite and calcite. The formation of this rare sulfosalt is based on the redissolution of other sulfosalts in the presence of chlorides.
The fine needles of dadsonite usually appear included in calcite, along with boulangerite. Once the calcite is removed by chemical processes, needles emerge in all their beauty. It can also be found forming radial aggregates in matrix cavities. The dadsonite from Sant Ponç can probably be considered among the best worldwide.

Size: 5.8 x 4.2 x 3.1 cm.
Found in ±1997.

Classic locality

These specimens from this Czech locality were initially cataloged as "hornblende", later studies indicated that it could be kaersutite, a member of the amphibole group. This specimen has a brownish tone that makes us think it could be a pseudomorphosis. It shows very well defined faces that can allow crystallography lovers to measure angles. An old sample.

Size: 4.2 x 2.3 x 1.5 cm.

Classic locality

Aesthetic group of tabular wulfenite crystals, defined by the dipyramid and the pinacoidal forms, with an intense orange colour and translucent. They are disposed on a goethite matrix. This specimen is surely from the Adami mine, known for its wulfenite.

Size: 5.5 x 5.2 x 2.9 cm.
Main crystal: 5 x 5 mm.

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

Scolecite and aerinite specimens from this Aragonese area are known worldwide. This specimen shows us groups of acicular crystals forming radiated aggregates in the dolerite and that, when extracted, allow us to see their internal arrangement perfectly. White in color, with iron oxydes patina, and good brilliance. Samples of this quality and size are not common and even less so today.

Size: 9.6 x 7.4 x 4.5 cm.
Main crystal: 17 mm. aggreg.

Classic locality

The Cyclopean Isles is a small volcanic archipelago off the coast of Aci Trezza, in the Etna volcanic complex. They are the type locality for the analcime species, which we can see in this specimen. This old time sample from the Freiberg Bergakademie shows us vacuoles with idiomorphic analcime crystals accompanied by colorless, well-defined thomsonite-Ca prisms those have grown on the analcime. The two labels give clear testimony to the antiquity of the specimen. A true mineralogical curiosity.

Size: 8.2 x 4.5 x 3.1 cm.
Main crystal: 2 mm.
Found in ±1860.

Freiberg Bergakademie
Type Locality