...Ekaterina Kaneva; Tatiana Radomskaya; Olga Belozerova; Roman Shendrik Abstract The results of combined single-crystal X-ray diffraction, electron probe microanalysis, Fourier microspectroscopy, and photoluminescence spectroscopy study of crystals of turkestanite from the Dara-i-Pioz deposit, Tien...

...F. C. J. Vilalva; S. R. F. Vlach Abstract Turkestanite, a rare Th- and REE -bearing cyclosilicate in the ekanite–steacyite group was found in evolved peralkaline granites from the Morro Redondo Complex, south Brazil. It occurs with quartz, alkali feldspar and an unnamed Y-bearing silicate. Electron...

..., rinkite, thorite, turkestanite, and vesuvianite). The total absorbed α-doses ranged from 1.4 × 10 15 to 6.1 × 10 18 α-decay mg −1 for cerite and uraninite, respectively. The 222 Rn emanation coefficients varied from 5 × 10 −5 % (uraninite) to 2.5% (turkestanite). The 220 Rn emanation coefficients varied...

... in large cages within the framework. The topology of the arapovite structure is identical to that of turkestanite, Th (Ca,Na) 2 (K 1– x □ x ) Si 8 O 20 (H 2 O) n , and steacyite, Th (Na,Ca) 2 (K 1– x □ x ) Si 8 O 20 , x ≈ 0.5. The topology of silicate minerals with [Si 8 O 20 ]8–units, including ekanite...

... of quartz with subordinate pectolite, aegirine, stillwellite-(Ce), polylithionite, leucosphenite and reedmergnerite. More rarely, turkestanite, galena, calcite, kapitsaite-(Y), neptunite, sugilite, baratovite, bismuth, sphalerite, fluorite, pyrochlore, fluorapatite, and zeravshanite occur in the same rock...