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

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Tue Jan 17 10:59:10 2006
Message-ID: <DIIE.0000001800004235_at_paulinet.de>

Hello Dave and List,

1. Jeff Grossman wrote this in 1998 (private communication)
   about A?fer 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
Received on Tue 17 Jan 2006 10:59:08 AM PST