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RM2720   Hambergite

Anjanabonoina pegmatites, Ambohimanambola, Betafo, Vakinankaratra, Madagascar

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.


Size: 7.2 x 5.2 x 4 cm.
Main crystal: 3.7 cm.

 

RM1834   Almandine-Spessartine

Ialamitana Pegmatites, Sahanivotry Manandona, Antsirabe II, Vakinankaratra, Madagascar

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.



 

RM1403   Euxenite-(Y)

Samiresy, Tritriva Commune, Betafo, Vakinankaratra, Antananarivo, Madagascar

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.


Size: 3.4 x 2.0 x 1.5 cm.
Found in ±1950.

Excol. L. Gautron.
Presents radioactive activity.
 

RM1194   Microcline var. amazonite

Imalo, Andrembesoa, Betafo, Vakinankaratra, Antananarivo, Madagascar

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.


Size: 8.6 x 4.0 x 4.0 cm
Main crystal: 17 x 16 mm.

 

RM1079   Elbaite-Liddicoatite with londonite and feldpar

Ambalabe pegmatite, Manapa pegmatite Field, Betafo, Vakinankaratra, Antananarivo, Madagascar

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.


Size: 5.3 x 3.7 x 2.8 cm.
Main crystal: 37 x 26 mm.

 

RM738   Euxenite-(Y)

Ambatofotsikely pegmatite, Betafo, Vakinankaratra, Antananarivo, Madagascar

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.


Size: 3,5 x 2,0 x 1,4 cm.

Desc./ Unkn. Col. Nr. 444.
Presents radioactive activity.


 
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