On the Crystal-Chemistry of Bjarebyite, BaMn2+2Al2(PO4)3(OH)3, From the Palermo #1 Pegmatite, Grafton County, New Hampshire, Usa
Academic Article
Publication Date:
2016
Citation:
On the Crystal-Chemistry of Bjarebyite, BaMn2+2Al2(PO4)3(OH)3, From the Palermo #1 Pegmatite, Grafton County, New Hampshire, Usa / N. Rotiroti, P. Vignola, D. Bersani, W.B. Simmons, A.U. Falster, R.W. Whitmore, J.W. Nizamoff, P. Lotti, A. Risplendente, A. Pavese. - In: CANADIAN MINERALOGIST. - ISSN 0008-4476. - 54:4(2016 Jul), pp. 1033-1041. [10.3749/canmin.1500112]
abstract:
Bjarebyite, BaMn2+2Al2(PO4)3(OH)3, is a rare secondary phosphate mineral in granitic pegmatites. From the
crystallographic point of view it is exhaustively described in the monoclinic unit cell with a 9.0671(2) Å, b 12.1500(4) Å, c
4.9403(1) Å, β 100.399(2)°, V 535.31(2) Å3, and space group P21/m. Single crystal X-ray diffraction data were collected with
MoKa radiation. The hydrogen positions were located by difference Fourier map and refined in the final steps of the crystal
structure anisotropic refinement, leading to an R index of 1.99%. A very good agreement was found with microprobe chemical
analyses and bond valence calculations which show expected values for all the atomic sites. These features were confirmed by
comparing the Raman spectra of bjarebyite and kulanite.
crystallographic point of view it is exhaustively described in the monoclinic unit cell with a 9.0671(2) Å, b 12.1500(4) Å, c
4.9403(1) Å, β 100.399(2)°, V 535.31(2) Å3, and space group P21/m. Single crystal X-ray diffraction data were collected with
MoKa radiation. The hydrogen positions were located by difference Fourier map and refined in the final steps of the crystal
structure anisotropic refinement, leading to an R index of 1.99%. A very good agreement was found with microprobe chemical
analyses and bond valence calculations which show expected values for all the atomic sites. These features were confirmed by
comparing the Raman spectra of bjarebyite and kulanite.
IRIS type:
01 - Articolo su periodico
Keywords:
bjarebyite; pegmatite phosphate; single-crystal X-ray diffraction; hydrogen bonding
List of contributors:
N. Rotiroti, P. Vignola, D. Bersani, W.B. Simmons, A.U. Falster, R.W. Whitmore, J.W. Nizamoff, P. Lotti, A. Risplendente, A. Pavese
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