We discovered two new metamict minerals in the Antsakoa I pegmatite near Berere in
Madagascar. They were recrystallized through heating and investigated with the following results: (…

VOLUME 46 page 279, right col., line 22: for Battey, HM read Battey, MH page 404, left col.,
line 42: for Sudot read Sudo page 409, right col., line 12: for medieval in read in medieval …

… petscheckite, a hexagonal mineral with idealized formula U4+ Fe2+(Nb, Ta) 2O8, is observed.
The Tiltvika petscheckite … the metamictization of a primary petscheckite. On the other hand, …

The occurrence and physicochemical characteristics of uranium bearing niobotantalate (UBN)
in a zoned pegmatite around Okene-Lokoja-Kabba roads junction, Kogi State Nigeria are …

… These peaks could be assigned to petscheckite (PDF 29-1426), a very rare oxide with …
On further heating at 800, 1000 and 1100 C for 21 hours the suspected petscheckite diffraction …

… At 800C petscheckite was found to crystallize along with euxenite recrystallization. However…
a multiphase system containing pyrochlore, petscheckite and high-temperature samarskite …

… niobate mineral are interpreted as alteration products of petscheckite. The chemical
formula of the … During this stage, petscheckite was altered to uranpyrochlore and oxy-petscheckite. …

… Since euxenite is considered to be a high temperature phase in REE-Nb-O systems with
AB2O6 stoichiometry, its transformation/disintegration to samarskite, petscheckite, pyrochlore …

Deposits of strategic metals, coupled with subalkaline lithium-fluoric granites, are common to
vast areas in the Russian Far East. They shape an extended rare-metal belt–Large igneous …

… After heating at 800 C, a breakdown of early pyrochlore is followed by forming new phases,
among them petscheckite and columbite were recognized coexisting with pyrochlore phase. …