Rosell Minerales

These specimens show yellowish nodules included in a feldspar matrix. First SEM-EDS analysis have yielded a phosphate of Th and Ca, with minor Pb. XRD has shown patterns of "bravantite", the old name for cheralite and brockite. The chemical base formula for these species are: grayite (Th,Pb,Ca)(PO4)·H2O; cheralite CaTh(PO4)2; brockite (Ca,Th,Ce)(PO4)·H2O. REE has not been found in EDS.
We could say that this yellow nodules belongs from altered monazite, formed by mixed species cheralite-grayite, with minor brockite. Accompanied in matrix by meta-autunite. We will send the full report.

Size: 5.3 × 3.7 × 3 cm.

Analyzed specimen with report

Makatite is a very rare sodium silicate. In this excellent specimen, it presents a good size aggregate formed by fine fibrous makatite needles, shiny and soft to the touch, on the matrix. It is accompanied by small but very transparent crystals of a pinkish to reddish villiaumite (NaF). Very representative for the species and the locality. Analyzed.

Size: 3.3 x 2.5 x 2.5 cm.
Main crystal: 1.3 cm aggreg.
Found in 1994.

Analyzed specimen with report

Globular aggregates of malachite, with an intense green color, brilliant and that stand out on a matrix of calcite. A specimen from Tsumeb and belonging from the Manchion collection (Barcelona).

Size: 7.2 x 4.8 x 4.3 cm.
Main crystal: 0.5 cm.

Classic locality

Gemmy, transparent to translucent, colorless crystals of anglesite. It shows a parallel growth of dipyramidal anglesite crystals, so rare from Tsumeb! On a matrix with dark gray to black mineral, possibly one of the manganese oxides. Very unusual. It was acquired to Bailey Minerals (Ángel Jesús Talabán García, Segovia 1942-Madrid 2007).

Size: 6.5 x 2.8 x 2.5 cm.
Found in ca. 1976.

Col. J. Astor (Barcelona). Adq.Bailey (Madrid).
Classic locality

Superb cerussite specimen from this worldwide classic locality. It shows a cyclic twin, with some more developed crystals, very brilliant, between translucent to transparent, with a very aesthetic pinkish red tone. It presents a second generation of prismatic type cerussite crystals that have grown locally on some faces. Very aerial and with a small matrix. It was acquired in 1975 from Bailey Minerals (Ángel Jesús Talabán García, Segovia 1942-Madrid 2007). A very aesthetic and good size piece.

Size: 6 x 5.6 x 3.8 cm.
Main crystal: 4 cm.
Found in ca. 1975.

Col. J. Astor (Barcelona). Adq.Bailey (Madrid).
Classic locality

Rich group of azurite crystals, with well-defined crystallographic forms, some of them doubly terminated. Intense and characteristic blue color and very brilliant. They are disposed on a matrix accompanied by well defined cerussite crystals, between translucent to transparent, with duftite. From this classic African mines.

Size: 6.5 x 6 x 4 cm.
Main crystal: 1.6 cm.

Classic locality

Group of tarnowizite crystals, well defined, some of them interpenetrated. Milky tone and translucent. On a rocky matrix. From this classic locality and from the former Manchion (Barcelona) collection.

 

 

Size: 4 x 3.8 x 3.7 cm.
Main crystal: 2 cm.
Found in ±1987

#365 Col. Manchion (Barcelona).
Fluorescent under long wave UV

Actinolite crystals are not usual with this size and definition. The specimen shows well-defined forms of the prism and monoclinic pinacoids, with the back side exfoliated. Intense green, almost black. A sample not usual for the species. It was determined that it is not an epidote, with which it could be confused, by Raman spectroscopy.

Size: 5.4 x 2.8 x 1.6 cm.
Found in 2018.

Aesthetic group of several descloizite crystals. Every one of these group of crystals is a group of little crystals of slightly curved edges, a typical shape in the classic samples from Namibia. Intense brilliance a deep color. From this former Sapnish collection.

Size: 4.0 x 3.3 x 3.2 cm.
Main crystal: 13 mm.
Found in 09/1986.

Col. Manchion #245

Incredible specimen formed by a native copper matrix, covered by calcite white rhombohedrons, very well defined and translucent. They are accompanied by numerous crystals of up to 2 mm of cuprite: exceptional under the magnifying glass. Most show the forms of the dodecahedron, but also in octahedra. A remarkable example of this classic mine.

Size: 6.6 x 4.4 x 1.1 cm.

Col. J.M. Manchion (Barcelona) - No.337 (Mineralexpo Sants,1987)

Vuggy specimen with many cavities lined with sharp tabular wulfenite crystals. They are transparent to translucent, orange to yellow color, with green duftite throughout and malachite globular aggregates. The wulfenite crystals are coated on a druse of white calcite rhombohedral crystals. The crystals are undamaged. Very different than usual.

Size: 8.0 x 4.5 x 6.2 cm.
Main crystal: 6 x 5 mm

Ex. M. Martínez (Barcelona)

An interesting and showy Tsumeb specimen, puffball of lustrous primary malachite acicular crystals, nicely disposed on matrix covered with very glassy, colorless, calcite rhombohedral crystals.

Size: 7.5 x 5.2 x 4.7 cm.

Ex. M. Martínez (Barcelona)

Vug in the rocky matrix totally covered by numerous tabular crystals of tarbuttite, forming parallel aggregates of green apple color. These tarbuttite crystals from the Skorpion mine can be considered among the best in the world.

Size: 6.7 x 6.0 x 3.7 cm.

Analyzed specimen with report

Aesthetic tarbuttite specimen formed by numerous tabular crystals, forming parallel aggregates of green apple color. These tarbuttite crystals from the Skorpion mine can be considered among the best in the world. They are partially covered with tiny crystals of fluorapatite, rich in Zn, but without becoming skorpionite. To my understanding many specimens of this deposit labeled as skorpionite are scholzite and/or fluorapatite rich in Zn. We will send analysis to the buyer. It is accompanied by lanceolate crystals of hemimorphite. Good sized specimen.

Size: 7.0 x 3.5 x 2.4 cm.

Analyzed specimen with report

A specimen from this classic locality of the world mineralogy totally different from the seen. It is an old piece of a German collection, made up of an array full of green mottramite nodules. One of its faces has been cut allowing to observe the aesthetic aggregates of intense green tone that remember leaves. He analyzed the sample and shows the presence of a certain percentage of As.The results are sent to the buyer. Something very different from Tsumeb ...

Size: 8.7 x 8.5 x 6.5 cm.

Excol. Sepp Sclick (D)

Excellent growth of cyclic twins of cerussite, with very sharp crystals and well defined faces and edges, transparent to translucent, really brilliant... A very good classic with a notable quality and coming from past 60's of the XXth. Not easy to find nowadays.

Size: 6.4 x 5.5 x 4.6 cm.
Found in ±1960

Group of very sharp and well defined rhombohedral crystals of smithsonite. With an nice luster, transparent to translucent and a nice pink color. On a matrix with pyrite. Aesthetic specimen from Tsumeb.

Size: 6.0 x 5.4 x 3.5 cm.
Main crystal: 7 x 4 mm.

A elongated vug lined with small calcite crystals on which are scatterd some radial clusters of acicular yellow to orange crystals of boltwoodite. This specimen is labeled as Rössing mine but during many years excellent boltwoodite samples were labeled as "Rössing" and thus confused with the Rössing Uranium mine in the area (which never produced any boltwoodite specimens). The correct locality is Goanikontes, a uranium claim 4 km SE of Goanikontes and 27 km E of Swakopmund, at a distance of 40 km from the Rössing Uranium Mine.

Size: 5.3 x 4.3 x 3.0 cm.
Main crystal: 4 mm.
Found in 1990's

Fluorescent under long wave UV

Leiteite is a very interesting zinc arsenate, one of the preciated rare species for Tsumeb Mine, which is the type locality. This is a elongated foliated to fibrous with pearlescent sample, with some transparence to translucent. This specimen was collected early 80s on mine level 44. A superb and really large specimen of this very rare mineral.

Size: 5.5 x 0.35 x 0.15 cm
Found in 1982.

A scepter quartz crystal with smoky tones, transparence and brilliance. With window growths on rhombohedral faces. Very aesthetic.

Size: 6.8 x 3.7 x 3.4 cm.

Group of rhombohedral smithsonite crystals, with a pink color. Accompanied by a group of quartz crystals. From a classic worldwide locality for mineral collectors.

Size: 10.0 x 7.2 x 5.8 cm.
Main crystal: 7 x 5 mm.
Found in 1990's.

An exceptional specimen. It shows a well-formed cyclic twin of cerussite crystals, well defined, bright, colorless and transparent. They are disposed very aerial on a matrix with malachite and some other crystals of the same species, also twinned but in "V" shape. A full aesthetic specimen of this very appreciated mine.

Size: 4.0 x 3.3 x 2.3 cm.
Main crystal: 27 x 14 mm.

A group of cerussite crystals from this classic mine. It is a very interesting specimen because one of the crystals shows a very unusual number of faces. It is transparent, brilliant and with tabular shape. Color is slightly yellowish and with inclusions. With some ciclic twins. Good one. From the collector and dealer Luis "Louie" Antonio Bravi Teixeira Leite (1942-1999).

Size: 5.4 x 4.0 x 3.7 cm.
Main crystal: 17 x 15 mm.

Ex-coll. Luis Leite. Nr. 523037.

Very rich group of smithsonite rhombohedral crystals. Light pink color, brilliant, transparent. A very interesting piece of this famous mine.

Size: 4.0 x 3.5 x 2.5 cm.
Main crystal: 3 x 3 mm.
Found in 1959-1962.

Very rich group of smithsonite rhombohedral crystals. Pink to reddish color, brilliant, transparent. A very interesting piece of this famous mine.

Size: 4.0 x 3.4 x 2.5 cm.
Main crystal: 4 x 3 mm.