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Complex crystal structures related to glaserite, K3Na(SO4)2 : evidence for very dense packings among oxysalts
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1981
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Crystal StructureEngineeringChemistryInorganic MaterialDense PackingsStructural MaterialsStructure ElucidationCrystal FormationMaterials ScienceInorganic ChemistryGlaserite ArrangementCrystal MaterialComplex Crystal StructuresCrystallographyCrystal Structure DesignMicrostructureGlaserite Structure TypeHexagonal RodCrystals
The glaserite structure type is based on hexagonal rod packing with twice as many Y — T rods as M — I rods, where Y = YO₁₀ (point symmetry 3 m), T = tetrahedron, M = octahedron, I = icosahedron. Some very complex structures exploit the glaserite arrangement, including α-Ca₃(PO₄)₂, apatite, β-Ca₃(PO₄)₂ or whitlockite, fillowite, griphite, NaCd₄(PO₄)₃, triploidite, graftonite ; and the structures based on a related net wyllieite and arrojadite. All structures are represented as plans down the rod axis showing the {6³} net and the important rods are shown as Penfield projections. Some very dense structures occur including grossular, griphite, wyllieite, arrojadite and fillowite.