Rosell Minerales

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.

Cuprodongchuanite is a mineral species with the formula Pb₄CuZn₂(PO₄)₄(OH)₂ that has been approved very recently (IMA No. 2021-065); is the copper analogue of dongchuanite (IMA No. 2021-058) with the formula  Pb₄ZnZn₂(PO₄)₄(OH)₂. Both species form a series and belong to the dongchuanite group, together with the zheshengite Pb₄ZnZn₂(AsO₄)₂(PO₄)₂(OH)₂ and the cuprozheshengite Pb₄CuZn₂(AsO₄)₂(PO₄)₂(OH)₂. Distinguishing one species from another is only possible by elemental analysis. For this reason these specimens have been analyzed by SEM-EDS.

In this specimen we have determined the cuprodongchuanite. The presence of As is detected in all the specimens studied, which would indicate that we are in a term of the series with cuprozheshengite. It would be correct to label it cuprodongchuanite-cuprozheshengite. It appears as light green globular aggregates on the colorless hemimorphite. The bluish color on the specimen is veszelyite.

 

Size: 2.2 x 2.1 x 1.2 cm.

Type Locality

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.

Rich 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.

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.

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.

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.

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.

Druse of jarosite crystals, very bright and with a characteristic brown color. From a mine little represented in collections.

Size: 5.5 x 5.3 x 2.3 cm.

Col. Peter Seroka (#591).

Specimen very rich in prismatic epidote crystals, well defined, with an intense green color, transparent to translucent. These pieces came out in the late 1990s and are different from the usual ones for the locality. It was acquired by Peter Seroka from G. Gautier at the Munich Show in 2002.

Size: 6 x 5 x 3.2 cm.
Main crystal: 12 mm.
Found in ±2002.

Gilbert Gautier (2002); Col. Peter Seroka (#140).

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

These specimens come from an andesite quarry located in NE Hungary. This quarry is worked by Colas Északkő Co. In year 2013, hyaline beautiful specimens of opal were collected. In the quarry explosives are used to excavate the rocks, so most of the specimes dissapears. From summer 2015 access is not permitted, but some specimens were collected before... These facts make it difficult to see good samples of this quality.
Hyalite opal (opal-AN) aggregates (crown shaped) are completely transparent, like drops of water, with an exceptional brightness. They are highly fluorescent under shortwave UV and also under longwave. Sometimes they accompanied by globular aggregates of calcite-aragonite. They are disposed very aerial on a porous matrix of andesite.

Size: 6.9 x 6.3 x 4.4 cm.
Found in ±2015.

Fluorescent under LW-UV and SW-UV lights

These specimens come from an andesite quarry located in NE Hungary. This quarry is worked by Colas Északkő Co. In year 2013, hyaline beautiful specimens of opal were collected. In the quarry explosives are used to excavate the rocks, so most of the specimes dissapears. From summer 2015 access is not permitted, but some specimens were collected before... These facts make it difficult to see good samples of this quality.
Hyalite opal (opal-AN) aggregates (crown shaped) are completely transparent, like drops of water, with an exceptional brightness. They are highly fluorescent under shortwave UV and also under longwave. Sometimes they accompanied by globular aggregates of calcite-aragonite. They are disposed very aerial on a porous matrix of andesite.

Size: 4.4 x 3.8 x 3.2 cm.
Main crystal: 2.4 x 2 cm. aggreg.
Found in ±2015.

Fluorescent under LW-UV and SW-UV lights

These specimens come from an andesite quarry located in NE Hungary. This quarry is worked by Colas Északkő Co. In year 2013, hyaline beautiful specimens of opal were collected. In the quarry explosives are used to excavate the rocks, so most of the specimes dissapears. From summer 2015 access is not permitted, but some specimens were collected before... These facts make it difficult to see good samples of this quality.
Hyalite opal (opal-AN) aggregates (crown shaped) are completely transparent, like drops of water, with an exceptional brightness. They are highly fluorescent under shortwave UV and also under longwave. Sometimes they accompanied by globular aggregates of calcite-aragonite. They are disposed very aerial on a porous matrix of andesite.

Size: 5.8 x 4.6 x 2.3 cm.
Found in ±2015.

Fluorescent under LW-UV and SW-UV lights

Druse of small autunite crystals, with a very intense greenish yellow colour, from this Portuguese mine. Under UV light it is spectacular.

Size: 5.5 x 3.6 x 2.5 cm.
Found in ±2018.

Fluorescente bajo LWUV - Fluorescent under LWUV
Presents radioactive activity.

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.

In 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.

In 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