[meteorite-list] Slashes and hyphens (and round brackets)

[bernd.pauli at paulinet.de]

Hello Dave and List,

1. Jeff Grossman wrote this in 1998 (private communication)
   about Açfer 160, classified as an LL3.8-6 chondrite:

The hyphen implies a continuous range, and also implies that
there is no dominant lithology in the breccia. Acfer 160 could
be:

a) a type 3 chondrite with a single equilibrated clast found;
b) a type 6 chondrite with a single type 3 clast found;
c) a mixture of types 3, 4, 5, and 6 material;
d) a light-dark breccia with mostly comminuted matrix
   and only a few clasts, including type 3 and 6 ones.

2. David Weir once wrote to the List:

"Based on the conventions followed by the NomCom as stated in the intro
to every Bulletin, for chondrite groups, petrologic types, shock stages,
and weathering grades, slashes (e.g., H5/6) indicate transitional assign-
ments.

Hyphens in petrologic type assignments for chondrites (e.g., H5-6) indicate
the range of types observed in breccias. Group names such as "L(LL)" indicate
uncertain assignments, with the less probable group in parentheses."

Regards,

Bernd