uxenite-(Y) is a niobium oxide containing titanium and tantalum, along with rare-earth elements (REE) such as yttrium and cerium, calcium, and radioactive elements like thorium and uranium, which give it detectable radioactivity. This specimen shows a group of parallel-growth crystals displaying the typical ochre-toned patina. Gamma-ray spectrometer measurements have been performed and are attached.

Reserved

Euxenite-(Y) is an 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. It shows an adhered numerical label reading #439, and the classic label from Z. Gabelica (Belgium) has been preserved. A good chance to get this rare species.

95 €

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This specimen is a recently discovered species from the pegmatites of Madagascar. It is a beryllium, lithium, and aluminium borate, LiAl₄Be₄(B₁₁Be)O₂₈. The specimen we offer exhibits several crystals with dodecahedral faces, good luster, and the characteristic milky-white color, aesthetically disposed on an elbaite crystal that reveals green and reddish hues under transmitted light. A top-quality miniature.

This new species can be confused with other minerals such as londonite or rhodizite, which are also found in this pegmatite. SEM-EDS analyses of these crystals confirmed the presence of K and Cs only in minor amounts, consistent with the empirical analytical results reported for the type material. You can consult the abstract of the preliminary publication by Hatert, F. et al. in The Canadian Journal of Mineralogy and Petrology (2025) 63 (6): 867–878 (https://doi.org/10.3749/250007). Analytical results will be provided to the buyer.

115 €

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This specimen is a recently discovered species from the pegmatites of Madagascar. It is a beryllium, lithium, and aluminium borate, LiAl₄Be₄(B₁₁Be)O₂₈. The specimen we offer exhibits several crystals with dodecahedral faces, good luster, and the characteristic milky-white color. A top-quality piece of good size, featuring well-defined crystals.

This new species can be confused with other minerals such as londonite or rhodizite, which are also found in this pegmatite. SEM-EDS analyses of these crystals confirmed the presence of K and Cs only in minor amounts, consistent with the empirical analytical results reported for the type material. You can consult the abstract of the preliminary publication by Hatert, F. et al. in The Canadian Journal of Mineralogy and Petrology (2025) 63 (6): 867–878 (https://doi.org/10.3749/250007). Analytical results will be provided to the buyer.

Reserved

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.

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.

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.

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