Liandratite, Columbite-(Fe)-Columbite-(Mn) Series
Berere Pegmatite Field, Bekapaika Commune, Tsaratanàna District, Betsiboka, Madagascar
I bought this from Gunnar Faerber at the 2020 Tuscon Gem and Mineral Show. He did the analysis. My own attached Si-PIN XRF shows that it has all the right elements. The Liandratite is the yellow vein on the right. My XRF shows Nb, Th, U, Ta, Fe, and Ti. Gunnar's own analyses of the Petscheckite and Liandratite follow:
Probe ...