Shulamitite Ca3TiFe3+ AlO8 - a new perovskite-related mineral from Hatrurim Basin, Israel

Sharyginite, Ca3TiFe2O8, A New Mineral from the Bellerberg Volcano, Germany

“…In the Raman spectrum of the holotype sharyginite the following main bands were noted (cm −1 ) (Figure 9a) [1]. Raman spectra of sharyginite from the other two localities (Figure 9b,c) were similar to the sharyginite spectrum from the Bellerberg.…”

“…The crystal structure of synthetic sharyginite, Ca 3 TiFe 2 O 8 , has been described before [6]. It is closely related to the structure of shulamitite [1] and consists of double layers of corner-sharing (Ti, Fe 3+ )O 6 octahedra which are separated by single layers of (Fe 3+ O 4 ) tetrahedra, which form zweier single-chains (Figure 8). These chains are characteristic for sharyginite, shulamitite and the structurally related brownmillerite.…”

“…Chemical data of other authors [1,3,12,40] are included in Table 4. [1,12]. The measurements were made for three different samples: E-2011, M7-184, and E-2-1, which are presented in Table 4 as A, B and C, respectively.…”

“…Finally, atoms were renumbered, and a cell transformation and origin shift were applied to closely match the model reported for shulamitite [1].…”

“…Sharyginite (P2 1 ma, Z = 2, a = 5.423(2) Å, b = 11.150(8) Å, c = 5.528(2) Å, V = 334.3(3) Å 3 ) is a Fe 3+ -analogue of shulamitite, Ca 3 TiFeAlO 8 [1], a member of the anion deficient perovskite group [2] and also an intermediate member of the pseudobinary perovskite CaTiO 3 -brownmillerite Ca 2 (Fe,Al) 2 O 5 series [3].…”