Rosell Minerales

A novelty at Sainte-Marie-aux-Mines 2013. Globular aggregates of tabular hemimorphite crystals showing an intense blue color and good luster. This blue color is unusual for the species and in relatively few deposits can be observed, it is usually colorless. The specimen is peppered by groups of very sharp cerussite crystals with good brilliance, some of them partially covered bay a black microcrystals, showing prismatic crystals and cyclic twins. The sample is from a recent find at the Kimbedi copper mining area in the Republic of Congo-Brazzaville.

A novelty at Sainte-Marie-aux-Mines 2013. Globular aggregates of tabular hemimorphite crystals showing an intense blue color and good luster. This blue color is unusual for the species and in relatively few deposits can be observed, it is usually colorless. The specimen is peppered by groups of very sharp cerussite crystals with good brilliance, some of them partially covered bay a black microcrystals, showing prismatic crystals and cyclic twins. From a recent find at the Kimbedi copper mining area in the Republic of Congo (Congo Brazzaville).

A huge size crystal of betafite showing defined octahedral faces (triangular) and developed dodecahedral ones. Very interesting for its crystallography and species. An oldie, classic and representative for the species. This specimen belonged to the collection of P. Sainfeld, mineralogist at the École des Mines de Paris.
Although the term betafite was discredited in 2010, many of us still are using this term to define this mineral when we see it. Our specimen is an uranium, calcium, titanium and niobium/tantalum oxide with radioactive activity. Currently the betafite is included as a variety within the pyrochlore supergroup. As a note, the rich uranium term has been only found in the Moon (oxyuranobetafite).

A huge size crystal of betafite showing defined octahedral faces (triangular) and developed dodecahedral ones. Very interesting for its crystallography and species. An oldie, classic and representative for the species. This specimen belonged to the collection of P. Sainfeld, mineralogist at the École des Mines de Paris.
Although the term betafite was discredited in 2010, many of us still are using this term to define this mineral when we see it. Our specimen is an uranium, calcium, titanium and niobium/tantalum oxide with radioactive activity. Currently the betafite is included as a variety within the pyrochlore supergroup. As a note, the rich uranium term has been only found in the Moon (oxyuranobetafite).

Sized elbaite-liddicoatite crystal, well defined, very aerial disposed, intense bourdeos red color, visible on the transparencies. It shows a striated prism faces with defines rhombohedral top faces. It shows a small dent that does not affect the aesthetics. On a feldspar matrix with sharp londonite crystals.

Euxenite-(Y) is an uncommon oxyde of niobium with tantalum and titanium and Rare Earth Elements (REE), with some calcium and radioactive elements like uranium or thorium. These elements give it a radioactive activity. This specimen we offer you is a cluster of parallel growth crystals, well-formed, with a chisel termination.With the classic ocher patina. A good chance to get this rare species.

An old specimen collected in the 50s by L. Gautron in the pegmatite dikes those are located about 20 km SW of the city of Antsirabé, in the main highland of Madagascar. It is a euxenite-(Y) crystal showing defined faces and rounded edges, with good size. A historical specimen.

Group of microcline crystals, amazonite variety, showing defined faces. They are embedded in a matrix of feldspar and smoky quartz. The color is good and very attractive.

Very well developed prismatic colorless transparent crystals of quartz showing phantom geometrical inclusions. These inclusions of pale green fuchsite crystals takes well defined forms. Crystals are free of damage. Very interesting specimen.

These specimens are labeled as corundum sapphire and ruby. They show a dual range of tones, between red to blue and purple, depending on the incident light and even within the same crystal. They have a very good quality and brilliance that makes them stand out from other of the same species. Crystals, which are doubly terminated, show the hexagonal prism, more or less elongated, and flattened pinacoidal terminal faces, sometimes with echeloned rhombohedral faces. On some faces we can observe geometric striated lines. They are disposed on a matrix of brilliant mica (muscovite) and feldspar.

From a classic locality for the species is coming this thorianite cube, with pointed faces of the octahedron, intense black color and brightness. The thorianite is a thorium oxide, almost always with some uranium content, the uranothorianite variety. This specimen contains about 5-6% by weight of uranium. We will send the analysis to the buyer.

Very sharp almandine-spessartine crystal from Madagascar pegmatites. Rich in faces, a textbook specimen. Under the light you can see transparencies of reddish tones, in fact it is of intense red. It is disposed very aerial on the matrix with feldspar and quartz. Complete, perfect, of a considerable size... The garnets from Ialamitana, has been found to be an intermediate almandine-spessartine (Mineralogical Record, 29, p. 132). A great piece for garnet group lovers.

Group of aegirine parallel growth with very elongated crystals, bright faces and very sharp and acute termination. Almost black green that makes it stand out for its aerial position on a matrix of smoky quartz crystals. A nice gem.

Very elongated crystal of aegirine, brilliant, defined with clearly visible terminal faces. A very aerial and aesthetic piece.

Group of sharp aegirine crystals in parallel growth, with striated prismatic shapes and sharp terminals. Good brilliance and very dark green, almost black. With a small quartz and feldspar matrix.

Group of smoky quartz crystals where one stands out for its development, brilliance and a very uniform smoky tone. Accompanied by prismatic black aegirine crystals, bright and with defined faces and edges. On a matrix of feldspar (microcline). Very aesthetic piece.

Druse formed by developed orthoclase crystals showing twins and complex combinations those we left for crystallography lovers. Good brilliance, defined edges and faces, uniform color, slightly marbled... A piece of quality, from a well-known locality.

Cluster formed by well developed orthoclase crystals showing twins and complex combinations those we left for crystallography lovers. They present some faces with hopper-like forms. Good brilliance, defined edges and faces, uniform color, slightly marbled... A piece of quality, from a well-known locality.

Interesting specimen of aegirine showing defined prisms with an intense color almost black, brilliance and sharp, prismatic and marked terminal faces. They are accompanied by a some groups of zircon crystals in parallel growth, showing the tetragonal prism and dipyramids. Good orange to yellowish tones, some transparency on edges and disposed in aerial way on aegirine matrix.

First appointment for this Moroccan locality. This lead, iron and rich copper sulfate has been analyzed by SEM-EDS, we will send results to the buyer. Beaverite-(Cu) forms yellow earthy masses formed by lenticular crystals. It is accompanied by fibrous malachite crystals and azurite crystal aggregates. In the matrix we have observed the presence of cerussite. Only the combination of colors and species in  this sample is aesthetic itself.

First appointment for this Moroccan locality. This lead, iron and rich copper sulfate has been analyzed by SEM-EDS, we will send results to the buyer. Beaverite-(Cu) forms yellow earthy masses formed by lenticular crystals. It is accompanied by fibrous malachite crystals and azurite crystal aggregates. In the matrix we have observed the presence of cerussite. Only the combination of colors and species in  this sample is aesthetic itself.

On a matrix of quartz crystals, with azurite, there are numerous fibrous aggregates of malachite crystals. Intense color, good brilliance and silky luster. A very bright piece.

A floater nodule with blackish and whitish spheroidal forms with some visible crystalline faces. They're a silicified fossil sponge which have preserved the original morphology of the biological specimens.

A vug that is lined with sharp, hexagonal, grayish-white nepheline crystals, accompanied by lustrous, black crystals of schorlomite as dodecahedral crystals. Schorlomite is a rare garnet group member and much of the material labeled "schorlomite" is, strictly speaking, titanian andradite. Excellent, highly representative combination material of the species. Not very often one can see well formed nepheline crystals of this species, especially crystals this size. Very aesthetic specimen from Jebel Bou-Agrao.

From what has been analyzed, Imini pyrolusites are partially replaced by manganite. This specimen is not at all common, since it shows us shapes in sheaf that remind us the German manganite specimens. Intense black color, very defined crystalline aggregates, with some isolated crystals... An exceptionally rare sample. On baryte matrix.