Abstract
Szaibelyite, ideally MgBO 2 (OH), from the Potash Corporation of Saskatchewan (New Brunswick Division) mine at Penobsquis, Kings County, New Brunswick, occurs in the Upper Halite member of the Windsor Group evaporites, and is associated with halite, sylvite, anhydrite, hilgardite, volkovskite, hydroboracite, walkerite and pringleite. Electron-microprobe analysis, supported by a single-crystal analysis of its structure, yielded: MgO 47.92 (46.28–48.71), FeO 0.74 (0.22–3.05), MnO 0.04 (0.00–0.08), (ideal B 2 O 3 ) 41.77 and (ideal H 2 O) 10.81, for a total of 101.18 wt.%. The empirical formula based on three anions is (Mg 0.99 Fe 0.01 )B 1 H 1 O 3 . Szaibelyite is monoclinic, P 2 1 / a , with refined unit-cell parameters a 12.586(1), b 10.415(1), c 3.1340(3) A, β 95.923(2)°, V 408.6(1) A 3 , Z = 8. The crystal structure refined to an R index of 0.031 using 1,191 unique reflections. The corrugated (100) sheets of [MgO 6 ] octahedra are cross-linked by isolated clusters of [B 2 O 4 (OH)] polyhedra. The [OH] groups strengthen the cross-linkage with hydrogen bonding. The fundamental building block (FBB) within the structure, 2Δ:2Δ, is compared to that in the structures of other borates, such as suanite and clinokurchatovite.
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