Rosell Minerales

Malachite stalactite with a very, very curious shape. Smooth on one side, with brilliant microcrystals of the same mineral. On the other side, it presents an elongated cavity formed by various growths. Floater, good size and quality.

Size: 14.5 x 3.9 x 3.6 cm.

Stalactitic malachite growths, with an intense color, brilliant, velvety and disposed aerially on the matrix.

Size: 12.2 x 6 x 5.2 cm.
Main crystal: 3.8 cm stal.

Stalactitic malachite growths, with an intense color, brilliant, velvety and disposed aerially on the matrix.

Size: 11 x 7.7 x 4.4 cm.
Main crystal: 3.9 cm. stal.

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

Specimen very rich in mimetite crystals, with shapes of the hexagonal dipyramid, some doubly terminated, with a slightly orange-yellow colour, very brilliant. They are disposed on a matrix of goethite with hemimorphite. From an unusual locality for the species. The specimen has been analyzed since it was labeled as pyromorphite. We will send the results to the buyer.

Size: 5.3 x 4.6 x 3.7 cm.

Analyzed specimen with report

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

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

Laminar crystals of kyanite, with a bluish tone, from this deposit located on the road between Canillas del Aceituno and Sedella. This specimen belongs from the Peter Seroka collection and is accompanied by the label.

Size: 7 x 6.6 x 3.7 cm.
Main crystal: 42 mm.
Found in ±1998.

Col. Peter Seroka (#222).

In this specimen we can enjoy different columbite crystals, one of them predominant, although there are smaller, transparent and reddish ones. The analyzes of the specimen indicate the majority presence of niobium and manganese, so it is a columbite-(Mn) (you can check analysis in pictures). The main crystal stands out for its faceting, it has a small dent without affecting the quality of the piece. It comes from the collection of Michel Jouty (1930-2016).

Size: 5.7 x 5.4 x 3.8 cm.
Main crystal: 8 x 7 mm.

Excol. Michel Jouty
Analyzed specimen with report

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.

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

A Catalan new found. Group of amethyst quartz crystals in parallel growth, transparent to translucent. On quartz matrix. The area is known for historical finds of smoky quartz crystals, not so much amethyst quartz.

Size: 6 x 5.5 x 5.2 cm.
Main crystal: 11 mm.
Found in 2021-22.

A Catalan new found. Group of amethyst quartz crystals in parallel growth, transparent to translucent. On quartz matrix. The area is known for historical finds of smoky quartz crystals, not so much amethyst quartz.

Size: 6.5 x 4.7 x 4 cm.
Main crystal: 10 mm.
Found in 2021-22.

Fairfieldite is a rare calcium and manganese phosphate of which the best known specimens belong to this North Carolina mine. In this specimen we can observe various aggregates of tabular crystals, transparent, very well defined and with a slightly beige tone. An excellent specimen for the species.
From what we have been able to elucidate, it is an old specimen, which belonged to the collection of Dr. Buford Nichols, a renowned North American pediatrician who is fond of minerals and specialized in phosphates.

Size: 7.4 x 3.8 x 2.8 cm.
Main crystal: 7 mm.
Found in ±1970.

Excol. B. Nichols (label); Col. Erich Laskowski.

Very well defined microcline crystal that shows us a very clean prism finished in complex shapes among which the Baveno twin can be observed. This specimen comes from the Peter Seroka collection and belongs from the quarries in the Bustarviejo area (Madrid).

Size: 7.8 x 2 x 2 cm.
Found in ±1990.

Col. Peter Seroka (#798).

Old specimen of piemontite from this Swedish classic locality, little represented in collections. They are small burgundy red crystals on a matrix with calcite (fluorescent under SW.-UV). It is accompanied by a label of Lazard Cahn (1865-1940), a renowned American mineralogist about whom you can see more information at this link: Memorial of Lazard Cahn, Amer. Mineralogist Vol. 26, pages 174-177, 1941.

Size: 6.5 x 3.8 x 3.4 cm.
Found in ±1930.

Col. Lazard Cahn (USA) old label 1931.

Rich aggregates of yuanfuliite needle like crystals, with orange-red color. They are accompanied by globular and brilliant calcite, hematite and yellow color richterite/fluoro-richterite and diopside sharp crystals. From this classic Spanish locality.

Size: 6.3 x 5.3 x 4.3 cm.

Col. Peter Seroka (#614).
Classic locality

This is an excellent specimen of cerussite in reticulated sixling-twin tabular crystals, a highly appreciated classic of Iranian mineralogy. It is not easy to find specimens with such a visible grid. They have a very remarkable brilliance and definition, translucent and snowy white much superior to what is usually seen. They are also known as "snowflake" cerussite. Good size and excellent aesthetics.

Size: 4 x 3.7 x 2 cm.

This is an excellent specimen of cerussite in reticulated sixling-twin tabular crystals, a highly appreciated classic of Iranian mineralogy. It is not easy to find specimens with such a visible grid. They have a very remarkable brilliance and definition, translucent and snowy white much superior to what is usually seen. They are also known as "snowflake" cerussite. Good size and excellent aesthetics.

Size: 3.8 x 3.7 x 2.3 cm.

This is an excellent specimen of cerussite in reticulated sixling-twin tabular crystals, a highly appreciated classic of Iranian mineralogy. It is not easy to find specimens with such a visible grid. They have a very remarkable brilliance and definition, translucent and snowy white much superior to what is usually seen. They are also known as "snowflake" cerussite. Good size and excellent aesthetics.

Size: 4.9 x 3.9 x 2.5 cm.

Aesthetic stalactitic aggregates of malachite, with brilliance and uniform green color. Very aesthetic.

Size: 12 x 11 x 8.5 cm.