...Dmitriy I. Rezvukhin; Sergey V. Rashchenko; Igor S. Sharygin; Vladimir G. Malkovets; Taisia A. Alifirova; Leonid. A. Pautov; Elena N. Nigmatulina; Yurii V. Seryotkin Abstract Two new mineral species of the crichtonite group: botuobinskite, ideally SrFe 2+ (Ti 4+ 12 Cr 3+ 6 )Mg 2 [O 36 (OH) 2...

...Dmitriy I. Rezvukhin; Taisia A. Alifirova; Andrey V. Korsakov; Alexander V. Golovin Abstract Large-ion lithophile elements (LILE)-enriched chromium titanates of the magnetoplumbite (AM 12 O 19 ) and crichtonite (ABC 18 T 2 O 38 ) groups have been recognized as abundant inclusions in orthopyroxene...

...Xiangkun Ge; Guang Fan; Guowu Li; Ganfu Shen; Zhangru Chen; Yujie Ai Mianningite (IMA 2014-072), ideally (☐,Pb,Ce,Na)(U 4+ ,Mn,U 6+ )Fe 3+ 2 (Ti,Fe 3+ ) 18 O 38 , is a new member of the crichtonite group from the Maoniuping REE deposit, Mianning county, Sichuan province, China. It was found...

... with I > 3σ( I ). Almeidaite is a member of the crichtonite group with Pb dominant in the A site (with 12-fold coordination) and Zn dominant in the T site (with 4-fold coordination). It is a Zn analogue of senaite and a Pb analogue of landauite. The mineral is named after Professor Fernando Flávio...

.... The crystal structures of mapiquiroite from these two occurrences were refined to R 1 = 0.028 and 0.032, respectively. Mapiquiroite is isostructural with other members of the crichtonite group. The name mapiquiroite honours four Italian mineral collectors, Riccardo Mazzanti, Luigi Pierotti, Ugo Quilici...

.... The crystal structure was refined to R = 0.0234 for 632 reflections with I o > 2σ( I o ) and is isostructural with senaite and all other members of the crichtonite group. The eight strongest X-ray powder-diffraction lines [ d in Å ( I/I 0 ) ( hkl )] are: 3.417 (100) (024), 3.012 (21) (300), 2.896 (61...

..., related to crichtonite, landauite and davidite-(Ce,La), may represent potentially new members of the crichtonite group. They display compositional zoning, and are associated with diverse oxide minerals, albite and alkali feldspar. Our compositions (EMP) suggest that the “large cations” (Sr, Na, K...

...Pierre-Alain WÜLSER; Nicolas MEISSER; Joël BRUGGER; Kurt SCHENK; Stefan ANSERMET; Michel BONIN; François BUSSY Abstract Cleusonite, (Pb,Sr)(U 4+ ,U 6+ ) (Fe 2+ ,Zn) 2 (Ti,Fe 2+ ,Fe 3+ ) 18 (O,OH) 38 , is a new member of the crichtonite group. It was found at two occurrences in greenschist facies...

...Paolo ORLANDI; Marco PASERO; Nicola ROTIROTI; Filippo OLMI; Francesco DEMARTIN; Yves MOËLO Abstract Gramaccioliite-(Y) is a new mineral within the crichtonite group. It was found in the gneiss of the Hercynian Massif of Argentera, at Sambuco (Stura Valley, Piedmont, Italy). It occurs as black...

...Paolo Orlandi; Marco Pasero; Giuseppe Duchi; Filippo Olmi Abstract Dessauite, a new mineral in the crichtonite group, occurs within cavities in calcite veins as tabular {001} rhombohedral, black, millimeter-sized crystals at Buca della Vena Mine, Apuan Alps (Tuscany, Italy). It is associated...

...A. P. Jones; V. Ekambaram Abstract Titanate minerals of the crichtonite series (AM 21 O 38 , A = Sr in crichtonite; M = Ti, Fe, Cr) reported from mantle peridotite xenoliths associated with kimberlites appear to be solid solutions of several named end members (mostly Ba, Sr, K, Ca) that contain...

... of the AM 21 O 38 series, characterized by predominant A-specific, large cations (Sr = crichtonite; Na = landauite; Pb = senaite; Ca = loveringite, and U + REE = davidite), and by M-formula small cations which are dominantly Ti, Cr, Fe, Mg, Zr, and Nb. Approximately 70% of the A-site is filled by either Ba...

... of 0.043. Loveringite is isostructural with senaite and crichtonite, with a structure based on a nine-layer ( hhc ···) close-packed anion lattice in which the A cation occupies an anion site and the M cations are ordered into 19 octahedral and 2 tetrahedral sites per unit cell. Microprobe analyses...