Brachina meteorite is the type specimen of the brachinites class of the asteroidal achondrites.
Naming and discovery [ edit ]
The meteorite is named after
Brachina in South Australia. Two fragments (total 200 g) were found by B.M. Eves at on 26 May 1974. 31°18′00″S 138°23′00″E / 31.300000°S 138.383333°E [1 ]
Description [ edit ]
The mineral composition of the Brachina meteorite is
olivine (80%), plagioclase (10%), Clinopyroxene (5.5%), iron-sulfide (3%), chromite (0.5%), chlorapatite (0.5%) and pentlandite (0.3%) and traces of meteoric iron. Melt inclusions consist of glass with orthopyroxene and anorthoclase. The chemical and mineralogical composition is similar to the Chassigny meteorite, but the trace elements are fundamentally different. [2 ]
Parent body [ edit ]
Melt inclusions indicate that there were melting processes active on the
brachinite parent body. [2 ]
Classification [ edit ]
The meteorite was classified as a
chassignite in 1978, but in 1983 trace element analysis showed that the Brachina meteorite was fundamentally different from [3 ] Chassigny. It was therefore proposed that the meteorite should be the type specimen of a new meteorite class, the brachinites. This classification has remained valid since then. [2 ] [1 ] [4 ]
See also [ edit ]
References [ edit ]
^ a b "Brachina". Meteoritical Society . Retrieved . 15 December 2012
^ a b c Nehru, C. E.; Prinz, M.; Delaney, J. S.; Dreibus, G.; Palme, H.; Spettel, B.; Wänke, H. (1 January 1983). "Brachina: A new type of meteorite, not a chassignite". Journal of Geophysical Research 88 (S01): B237. Bibcode: 1983JGR....88..237N. doi: 10.1029/JB088iS01p0B237.
^ Graham, A. L. (1978). The Meteoritical Bulletin 55: 331. Bibcode: 1978Metic..13..327G.
^ Grady, Monica M. (2000). Catalogue of meteorites (5th ed. rev. and enl. ed.). Cambridge: Cambridge University Press. ISBN 9780521663038.