1981•Bulletin de MinéralogieRequires access

Magniotriplite : its crystal structure and relation to the triplite˗triploidite group

C. Tadini

Abstract

The unit cell parameters of magniotriplite (Mg, Fe)₂ (PO₄)(F, OH), from Albères (Pyrénées, France), are : a = 12.035(5), b = 6.432(4), c = 9.799(2) Å, β = 108.12°(2) ; Z = 8. The crystal structure can be derived from that of the members of triplite-triploidite group : magniotriplite and triplite are isotypic. The least-squares refinement, carried out in both space-groups I2/a and Ia, reduced the conventional R factor to 0.033 for centric and 0.034 for acentric space group. (F, OH) atoms have a disordered distribution on the sites of the space group I2/a and ordered arrangement in the sites of the space group Ia.

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Key concepts: Acentric factor, Group (periodic table), Space (punctuation), Crystallography, Crystal structure, Unit (ring theory), Chemistry, Crystal (programming language)