Vector representation of some mineral compositions in the aenigmatite group, with special reference to hogtuvaite

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Abstract

Aenigmatite-group compositions conform to the general formula A2B6T6O20, where [8]A cations are Na and Ca, [6]B are Fe2+, Fe3+, Mg, Al, Cr, Ti, and Sb5+, and [4]T are Si, Al, B, and Be in named end-members. Graphical representation of the compositional relations among the phases is made possible by the vector method. When this approach is used on the aenigmatite group, the compositions of the main minerals are derived from that of aenigmatite by application of the basis vectors CaAl(NaSi)-1, Al2(MgTi)-1, and Al2(MgSi)-1. Hogtuvaite is derived by BeSiAl-2 acting on rhonite, and welshite by AlSbBe(MgTiSi)-1 acting on hogtuvaite. -from Author

Original languageEnglish (US)
Pages (from-to)449-457
Number of pages9
JournalCanadian Mineralogist
Volume32
Issue number2
StatePublished - Jan 1 1994

ASJC Scopus subject areas

  • Geochemistry and Petrology

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