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Mn- and F-bearing rasvumite in natrocarbonatite at Oldoinyo Lengai volcano, Tanzania

Published online by Cambridge University Press:  05 July 2018

B. C. Jago  and
J. Gittins
B. C. Jago
Affiliation:
Lakefield Research Ltd. Postal Bag 4300, 185 Concession Street, Lakefield, Ontario, Canada K0L 2H0
J. Gittins
Affiliation:
Department of Geology, University of Toronto, Toronto, Canada M5S 3B1
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Abstract

Several K-Fe sulphide minerals have been described from natrocarbonatite lavas erupted from the Tanzanian volcano Oldoinyo Lengai but uncertainty remains about their exact identity. They do not appear to be any of the established K-Fe sulphides according to Dawson et al. (1995) and Mitchell (1997). Here, we describe yet another variant which is a Mn- and F-bearing variety of rasvumite. It appears to have formed by reaction of Fe alabandite grains with natrocarbonatite magma and occurs as minute rims on the alabandite. Its formula is: (K0.94Na0.06)(Fe1.91Mn0.13Ca0.01Sr0.01)(S2.06F0.24Cl0.04).

Keywords

K-Fe sulphidenatrocarbonatiteOldoinyo LengairasvumiteTanzaniamanganesefluorine
Type
Research Article
Information
Mineralogical Magazine , Volume 63 , Issue 1 , February 1999 , pp. 53 - 55
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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