...Roland C. Rouse; Donald R. Peacor; Stefano Merlino Abstract The beryllophosphate mineral pahasapaite, (Ca 5.5 Li 3.6 K 1.2 Na 0.2 □ 13.5 )Li 8 Be 24 P 24 O 96 ·38H 2 O is cubic, I 23, with a = 13.781(4) Å and Z = 1. Its structure, which has been refined to residuals of 0.047 (unweighted) and 0.035...

...Fig. 4 Comparison of the tetrahedral framework in zeolite-RHO (A – McCusker, 1984 ), in pahasapaite (B – Rouse et al. , 1987 ), and in wilancookite (C – this work). (Online version in colour.) ...

... beryllophosphate, together with pahasapaite and wilancookite; it is also the first phosphate with a framework identical to that of a natural zeolite silicate. §   Corresponding author e-mail address : [email protected] The new barium beryllophosphate mineral limousinite occurs at the historical...

..., such as tiptopite with the sodalite-type framework, K 2 (Li,Na,Ca) 6 (Be 6 P 6 )O 24 (OH) 2 ⋅1.3H 2 O (Grice et al. , 1985 ), pahasapaite with the zeolite RHO -type framework, Li 8 (Ca,Li,K) 10 Be 24 (PO 4 ) 24 ⋅38H 2 O (Rouse et al. , 1987 ), and limousinite, BaCa[Be 4 P 4 O 16 ]⋅6H 2 O and wilancookite, (Ba...

... viewed approximately along the a -axis with β-cages connected by four-membered double rings. (d) The α-cage (symmetry m 3 m ) as found in hydrated zeolite rho (RHO). (e) The α-cage (symmetry 23) as found in pahasapaite. BeO 4 tetrahedra have light rims and PO 4 tetrahedra have dark rims. ...

... Vydří and (probably) Otov in Czech Republic, respectively. Otherwise, it is well known as an alteration product of beryl in, e.g., the Finnish Viitaniemi pegmatite and Norrö, Sweden ( Volborth 1954 , Nysten and Gustafsson 1993 ). Additional occurrences are listed by Burt (1975b) Pahasapaite...

... ·5H 2 O], framework structures [hurlbutite, CaBe 2 P 2 O 8 , babefphite, BaBe(PO 4 )F, beryllonite, NaBe(PO 4 )], structures containing clusters of tetrahedra [gainesite, Na 2 BeZr 2 (PO 4 ) 4 ·1.5H 2 O], and even zeolite-type structures [pahasapaite, Li 8 (Ca,Li,K) 10.5 Be 24 (PO 4 ) 24 ·38H 2 O...

... Yang and Robert T. Downs *E-mail: [email protected] Related to pahasapaite Cubic: I 23; structure determined a = 13.5398(2) Å 6.90(60), 5.54(80), 3.630(60), 3.212(70), 3.043(100), 2.885(70), 2.774(80), 2.398(60) Cotype material is deposited in the collections...

... beryllium zeolites include hsianghualite, pahasapaite, roggianite and weinebeneite ( Coombs et al. , 1998 ). A detailed discussion and comparison of the structural features of beryllium zeolites and other beryllium silicates is reserved for a separate paper (Grice et al. , in preparation). Arne...

..., pahasapaite, palermoite, panethite, parafransoletite, parahopeite, pararobertsite, parascholzite, penikisite, petitjeanite, phosphoellenbergerite, phosphoferrite, phosphogartrellite, phosphophyllite, pretulite, qingheiite, raadeite, ranunculite, rimkorolgite, rittmannite, robertsite, rosemaryite, sampleite...

...) magnesiotaaffeite-6 N ′3 S * MgAl 5 [BeMgAlO 12 ] 5.682(1) a 41.150(10) - R 3̅ m (53) odintsovite K 2 Na 4 Ca 3 Ti 4+ 2 O 2 [Be 4 Si 12 O 36 ] 14.243(3) 13.045(4) 33.484(6) - Fddd (54) pahasapaite Ca 8 Li 8 [Be 24 P 24 O 96 ](H 2 O) 38 13.783(1) a a - I 23 (55...

... 3 Ti 2 Be 4 Si 12 O 38 Silicate 543 Be81 Oftedalite g K(CaSc)Be 3 Si 12 O 30 Silicate Milarite 234 a Be82 Pahasapaite Li 8 (Ca,Li,K) 10 Be 24 (PO 4 ) 24 ·38H 2 O Phosphate Zeolite 3920 Be83 Parafransoletite Ca 3 Be 2 (PO 4 ) 2 (PO 3 OH) 2 ·4H 2 O Phosphate 168 Be84...

...Figure 15. The crystal structures of tiptopite, weinebeneite, and pahasapaite: (a) tiptopite projected onto (001); (b) tiptopite projected onto (010); (c) weinebeneite projected down the c-axis; (d) weinebeneite projected onto (010); in both (c) and (d), 4.8 2 nets of tetrahedra link...

...-A, levyne, chabazite, zeolite Y (SiO 2 -faujasite) and RHO-zeolite (SiO 2 -pahasapaite). Microporous minerals with sodalite- and cancrinite-type structures are not considered zeolites, according to Coombs et al. ( 1997 ), but rather as “feldspathoids”. However, we prefer a broader view here as the crystal...

.... Mohs hardness is 4–5, by analogy with related pahasapaite. The density could not be measured due to small grain size; D calc = 3.05 g/cm 3 . Wilancookite is isotropic, colorless, non-pleochroic, with n = 1.560(2) (λ = 590 nm). The Raman spectrum is characterized by peaks at 430 (Be–O), 580 ( ν 4...

...) 2 O 2 [Be 4 Si 12 O 36 ] Veins associated with peralkaline intrusives Malomurun alkaline complex, Irkutsk Oblast’-Sakha Republic (Yakutiya), Russia; Ilímaussaq, South Greenland Konev et al. (1995 , 1996 ); Rastsvetaeva et al. (1995) ; Petersen et al. (2001) Pahasapaite (a zeolite...