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The crystal chemistry of lamprophyllite-related minerals: a review

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The crystal structures of the lamprophyllite-related minerals are based upon HOH modules consisting of a central octahedral O sheet sandwiched between two heteropolyhedral H sheets. The general crystal-chemical formula for these minerals can be written as [10-11]A2[[6] M1[6] M22 [6] M3X 2] [[5] L 2(Si2O7)2O2], where the contents of the O and H sheets are given in square brackets in this order and A = Ba, Sr, K, Na; M1 = Na, Mn2+; M2 = Na, Mn2+, Fe2+, Ca; M3 = Ti, Mn2+, Mg, Fe3+, Fe2+; L = Ti, Fe3+; X = OH, O, F. According to the unit-cell parameters and symmetry, lamprophyllite-related minerals can be subdivided into five structure types: I (monoclinic polytypes, C2/m); II (orthorhombic polytypes, Pnmn), III (nabalamprophyllite, BaNa[Na3Ti(OH)2][Ti2(Si2O7)2O2], monoclinic, P2/m , with an ordered arrangement of the interlayer Ba2+ and Na+ cations), IV (triclinic, P1) and V (triclinic, P1). The triclinic members (types IV and V) include schüllerite and its analogues, which differ from the lamprophyllite-group minerals sensu stricto in their symmetry and topology of the HOH modules. The end-member formulae of lamprophyllite-related minerals and the position of schüllerite in the ranks of heterophyllosilicates are discussed.
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Keywords: CHEMICAL COMPOSITION; CRYSTAL-CHEMICAL FORMULAE; HETEROPHYLLOSILICATES; LAMPROPHYLLITE-RELATED MINERALS; OD STRUCTURE; POLYTYPISM; SCHÜLLERITE; TOPOLOGICAL FEATURES

Document Type: Research Article

Publication date: 31 December 2016

This article was made available online on 14 June 2016 as a Fast Track article with title: "The crystal chemistry of lamprophyllite-related minerals".

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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