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K-poor titanian fluor-richterite from near Nullagine, Western Australia.

Leake, Bernard E., Farrow, Colin M. and Townend, Roger 1995. K-poor titanian fluor-richterite from near Nullagine, Western Australia. American Mineralogist 80 (1-2) , pp. 162-164. 10.2138/am-1995-1-215

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Abstract

Strongly zoned amphibole formed oftitanian fluor-richterite cores with 2.24% TiO2 and margins oftitanian ferro-richterite with 6.65% TiO2 is described from a basaltic andesite. The cores are richer in F, AI, Mg, and Ca than the edges, which are richer in OH, Ti, Fe, Na, and K. Similar sodic-calcic amphiboles are widely known to appear in lamproites, but typically they contain 5% or more K2O, whereas the present sample reaches a maximum of 1.18% K20 at the margin. As is characteristic of titanian potassium richterite, there is Ti in tetrahedral coordination and a pink to yellow pleochroism. Ba, Sr, Li, B, CI, Be, Nb, La, Ce, Pr, Y, V, and Zr contents are given. Zoned augite with Ca42Mg42Fe16 cores and Ca43Mg36Fe22 rims is also present, plus chloritic material and feldspar.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Publisher: Mineralogical Society of America
ISSN: 0003-004X
Last Modified: 09 Jul 2020 15:15
URI: http://orca-mwe.cf.ac.uk/id/eprint/133069

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