AL kindly wrote:
"I believe there is an absence of olivine in mesosiderites."
Objection, Your Honor!
Norton O.R. (2002) The Cambridge Encyclopedia of Meteorites, p. 157:
"Accessory amounts of olivine are also present in mesosiderites"
"...the mineralogy of the silicate portion...is ...orthopyroxene and
plagioclase with minor amounts of olivine."
Norton O.R. (2008) Field Guide to Meteors and Meteorites, p.173:
a) Figure 8.10: "Estherville...Silicates include olivine, pyroxene, and
plagioclase..."
b) Figure 8.11: "Vaca Muerta...Like Estherville, it contains eucritic pebbles
and
many silicate inclusions..."
T.H. Burbine et al. (1996) Mantle material in the main belt:
Battered to bits (Meteoritics 31-5, 1996, 607-620, p. 609):
"Mesosiderites are stony-iron meteorites containing Ni-rich Fe metal and mafic
silicates (Floran, 1978). The amount of metal has been found to vary from 17
to 80 wt% but is usually between 40 to 60% (Mason and Jarosewich, 1973). The
silicates are mainly orthopyroxene and plagioclase with lesser amounts of other
silicates such as pigeonite and olivine (Floran, 1978)."
By the way, a few years ago, Martinez Rodrigo offered thin Vaca Muerta slices
with predominantly eucritic components and / or olivine crystals. Some of the
olivine-rich slices were cut so thinly that they were even translucent when held
up against the light.
Best wishes,
Bernd
______________________________________________
Visit the Archives at http://www.meteoritecentral.com/mailing-list-archives.html
Meteorite-list mailing list
Meteorite-list@meteoritecentral.com
http://six.pairlist.net/mailman/listinfo/meteorite-list
