John inquired:well difference between 3.8 and 3.9 is a bit relative to the observer and by definition of type 3, fayalite amount is highly variable so it cannot be used for pairing purposes!
> Can anyone tell me if any of the different numbered NWA
> R-chondrites are paired? Like NWA 753 and 978, both R3.8's
Hello John and List,
According to the Meteoritical Bulletin #85,
NWA 753 is a R3.9 rumurutiite chondrite,
and its fayalite is Fa38.6�3.2 (range Fa20-41)
and:
NWA 978 is classified as an R3.8 chondrite
in Met.Bull. #86 with a slightly higher Fa
value of: Fa41.9�0.2
In other words, they are probably unpaired.
Pierre
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