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TRIPARTITE DIVISION OF THE SYSTEM 2REEPO₄ – CaTh(PO₄)₂ – 2ThSiO₄, DISCREDITATION OF BRABANTITE, AND RECOGNITION OF CHERALITE AS THE NAME FOR MEMBERS DOMINATED BY CaTh(PO₄)₂

Kees Linthout

Institute for Geo- and Bioarchaeology, Faculty of Earth and Life Sciences, Vrije Universiteit, De Boelelaan 1085, 1081 HV, Amsterdam, The Netherlands

View larger version (15K): [in this window] [in a new window]   FIG. 1. The frequently used, but now discredited, six-fold division of Bowie & Horne (1953). After Rose (1980). A marks the type cheralite, and B, the now-discredited type "brabantite".

View larger version (26K): [in this window] [in a new window]   FIG. 2. Nomenclature diagram for the system 2REEPO4 – CaTh(PO4)2 – 2ThSiO4. The new tripartite division for the system monazite – cheralite – huttonite, with compositions of members from the literature. In computing the end-member proportions, Pb, Sr, Fe2+, Mn2+, Mg, Cu, and U, Ti and Zr are combined with CaTh(PO4)2; any remaining Th is combined with Si in ThSiO4; Al, Fe3+, and Y are included in the REEPO4 component. * The proportion of compositions plotted in this diagram versus the total of compositions in the referred paper; the remaining compositions are discarded for not complying with quality criteria given in the text. ** Compositions not meeting the criteria, but plotted for historical reasons (see text).