[meteorite-list] Exciting News from Norway

[Matson, Robert]

Hi Geoff and List,

Thanks for forwarding the news of the success of the Mike-Morton-Robert
team in Norway.  The small chondrule size mentioned by Mike would tend
to rule out the vast majority of chondrite types:  CV, LL, CR, CK, L,
EL and K chondrites all have mean chondrule diameters greater than
500 microns.  However, CO chondrules are tiny with average chondrule
size in the 150-micron range (0.15 mm).  (The only carbonaceous
chondrite
with smaller chondrules is CH -- and these are much, much smaller --
20 microns.)  Unless Mike is saying that the chondrules are quite a bit
smaller than a half-millimeter, it would seem that CM is a better match
(mean diameter ~300 microns).  Marcin, Matteo and Marco (3Ms):  your
guesses are looking better!  (P.S.  Did your first names have any
influence
on your CM guess?  ;-)

EH, H and rumurutiites also have mean chondrules sizes in the 200-400
micron range, but Mike has seen enough meteorites that he should be
able to rule out these types.  --Rob