Rosell Minerales

Hambergite is a rare mineral species, a beryllium hydroxyborate, which occurs in the tourmaline pegmatites of Anjanabonoina. This sample shows us a group of crystals of exceptional size and quality, flattened and with well-defined terminations. Transparent to translucent, with brilliance. This mineral is usually found as single crystals, rarely on matrix, and less with this size. A museum piece.

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.
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).

Group of hyaline quartz crystals, very transparent, brilliant, with complex shapes due to polycrystalline and window growths. With orange inclusions. Very aesthetic and interesting specimens from a new Malagasy locality.

Curious parallel growth of quartz crystals in scepter. A very aesthetic miniature of a new locality in Madagascar.

Group of hyaline quartz crystals, very brilliant, one of them more developed and showing the scepter growth stands out. With polycrystalline growths. An aesthetic novelty from Madagascar.

Aesthetic quartz specimen, very transparent and with orange inclusions. It shows a very curious window growths and some facets of the rhombohedron. These specimens come from a little-known locality. Really interesting.

Group of doubly terminated quartz crystals, very transparent and with orange inclusions. With prisms and terminal faces with very evident polycrystalline and window growths. These specimens come from a new not well-known locality. Very aesthetic and pure brilliance.

A good size specimen showing a group of cubic fluorite crystals, between translucent and transparent, with an intense green color with delicate dichroism under sunlight. The crystals are interpenetrated and show geometric color zoning and interesting and esthetic inclusions of white color. Very fluorescent under LW-UV and SW-UV. New locality for fluorite in Madagascar.

A good size specimen showing a group of cubic fluorite crystals, between translucent and transparent, with an intense green color with delicate dichroism under sunlight. The crystals are interpenetrated and show geometric color zoning and interesting and esthetic inclusions of white color. Very fluorescent under LW-UV and SW-UV. New locality for fluorite in Madagascar.

Group of cubic fluorite crystals, between translucent and transparent, with a deep green color with delicate dichroism under sunlight. The crystals are interpenetrated and showing geometric color and inclusions zoning. Very fluorescent under LW-UV and SW-UV. New locality/area for fluorite from Madagascar.

Group of cubic fluorite crystals, between translucent and transparent, with a deep green color with delicate dichroism under sunlight. The crystals are interpenetrated and showing geometric color and inclusions zoning. Very fluorescent under LW-UV and SW-UV. New locality/area for fluorite from Madagascar.

Group of cubic fluorite crystals, between translucent and transparent, with a deep green color with delicate dichroism under sunlight. The crystals are interpenetrated and showing geometric color and inclusions zoning. Very fluorescent under LW-UV and SW-UV. New locality/area for fluorite from Madagascar.

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 Peraud-Pregilbert (France).
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).

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.

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.

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.

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.

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.

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.

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.

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).