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Satterlyite, (Fe,Mg)₁₂(PO₃OH)(PO₄)₅(OH,O)₆

Institut für Mineralogie und Kristallographie, Geozentrum, Universität Wien, Althanstr. 14, A-1090 Wien, Austria

¹ e-mail: uwe.kolitsch{at}univie.ac.at

The crystal structure of satterlyite from the Big Fish River area, Yukon Territory, Canada, (Fe_0.77Mg_0.23)₁₂ (PO₃OH)(PO₄)₅(OH,O)₆ (space group P31m, a = 11.355(1), c = 5.0394(5) Å, V = 562.71(9) ų, Z = 1), has been solved and refined using single-crystal intensity data (Mo K X-radiation, CCD area detector, 2320 unique reflections with F₀ > 4(F₀), Rl = 2.15 %). The structure is based upon pairs of face-sharing, distorted (Fe,Mg)O₆ octahedra linked by edge-sharing to form double chains along [001]. Each double chain shares ligands with six other double chains to produce a three-dimensional network hosting three unique PO₄ tetrahedra which are corner-linked to the (Fe,Mg)O₆ octahedra. The two unique (Fe,Mg)O₆ octahedra are characterised by different occupancies; Fe:Mg ratios of the M(1) and M(2) sites are 0.838(2):0.162(2) and 0.706(2):0.294(2), respectively. Two H atoms are each bonded to common ligands of the two (Fe,Mg)O₆ octahedra. The third, strongly disordered H(3) atom is bonded to the apical O of the P(l)O₄ tetrahedron. The H(3) site and possibly both the other two H sites are only partially occupied, and only very weak hydrogen bonds exist. Satterlyite is isostructural with holtedahlite, Mg₁₂(PO₃OH,CO₃)(PO₄)₅(OH,O)₆. Unlike in natural holtedahlite, there is no carbonate-for-phosphate substitution in the satterlyite investigated, which was also confirmed by IR absorption powder spectra. A structural relationship exists with phosphoellenbergerite, Mg₁₄(PO₄)₆(PO₃OH)₂(OH)₆. Polarised IR spectra of oriented cut single crystals in the O-H stretching vibrational range revealed an asymmetric band at 3536 cm^-1 (including a weak shoulder at 3568 cm^-1) and an asymmetric band at 3471 cm^-1. The number of hydroxyl vibrational bands and their positions are in accordance with the results of the structure refinement.

Key-words: satterlyite, crystal structure, crystal chemistry, infrared spectroscopy, holtedahlite.