[meteorite-list] RICHLAND

From: Michael Farmer <meteoriteguy_at_meteoritecentral.com>
Date: Tue, 20 Mar 2007 08:41:22 -0700 (PDT)
Message-ID: <327461.76470.qm_at_web33113.mail.mud.yahoo.com>

thank you Jeff,
after more than seven years of trying to get this
information with no success, it is nice to put to rest
the issue and close the book on "fredericksburg".

Michael Farmer

--- Jeff Grossman <jgrossman at usgs.gov> wrote:

> First of all, for the many of you without access to
> Geochimica et
> Cosmochimica Acta, here is the quote from Wasson,
> J.T., Huber, H.,
> and Malvin, D.J. (2007) Formation of IIAB iron
> meteorites. GCA 71, 760-781:
>
> >The 47-kg Fredericksburg (Texas) iron was first
> reported
> >to us by a person living in Alaska, who stated that
> it had
> >been inherited from a deceased relative who had
> lived near
> >Fredericksburg. Our analysis of the sample shows
> that,
> >within error, its composition is the same as that
> of the
> >Richland (Texas) iron. Both irons appear to be
> strongly
> >weathered. However, these two Texas locations are
> >297 km apart, farther apart than plausible for a
> strewn
> >field. Our best guess is that human transport has
> been involved,
> >and that they are fragments from the same fall
> >event. Fredericksburg is not an approved name; we
> suggest
> >that this mass be referred to as Richland
> (Fredericksburg)
> >unless future studies imply that it resulted from a
> distinct
> >fall.
>
> There are many irons with multiple named masses,
> although all of the
> masses share the same formal name, in this case
> "Richland." For
> historical reasons, as well as to recognize to
> possibility that
> pairings are never 100% certain, the names of the
> individual masses
> are frequently preserved in catalogs and the
> literature, and should
> be preserved by dealers and collectors as well. In
> this case,
> changing the "main mass" designation (which I
> consider to be a sloppy
> term) doesn't really help the situation. It will
> always be better to
> refer the new piece as the "Fredericksburg mass of
> Richland" or, as
> Wasson suggests, the "Richland (Fredericksburg)
> mass".
>
> Another classic example of an iron with multiple
> named masses is
> North Chile, which includes, among others, the
> well-known Filomena
> and Tocopilla masses.
>
> I've now added the Richland synonyms to the MetBull
> database.
>
> Jeff
>
> At 01:21 AM 3/20/2007, Sterling K. Webb wrote:
> >Hi, All,
> >
> > Strictly as a dumb and innocent bystander on
> the
> >Thread: Illinois Irons, which is now and forever
> more
> >shall be about a Texas/Alaska Iron, I have a dumb
> >and innocent question (lamb to the slaughter).
> >
> > Here's what the Catalogue of Meteorites says
> >about RICHLAND:
> >
> >A mass of 30lb (13.6kg) was found when
> >an old well was being cleaned out. Listed,
> >F.C. Leonard (1956).
> >
> >Analysis, 5.56 %Ni, E.P. Henderson &
> >O.E. Monnig (1957).
> >
> >It has been suggested that it is a transported
> >piece of Coahuila, but is chemically distinct.
> >More recent analysis, 5.40 %Ni, 60.6 ppm.Ga,
> >182 ppm.Ge, 8.2 ppm.Ir, J.T. Wasson (1974).
> >
> >Structurally distinct from Coahuila; shock-melted
> >troilite, V.F. Buchwald (1975).
> >
> > Here's my dumb and innocent question: If the
> >mass of RICHLAND is 13.6 kilos and the mass of
> >(RICHLAND (FREDERICKSBERG) is 47+ kilos,
> >and FREDERICKSBERG is a piece of RICHLAND,
> >isn't Mike's 47 kilos (you carried it thru the
> airport?)
> >the Main Mass?
> >
> > Naive little physicist says if they are two
> pieces
> >of the same meteoroid that fell at the same time,
> the
> >biggest piece is the Main Mass, as in, that
> corresponds
> >to the physical reality.
> >
> > OK, ready for the beaurocratic axe to fall.
> >
> >
> >Sterling K. Webb
>
>---------------------------------------------------------------------
> >
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>
> Dr. Jeffrey N. Grossman phone: (703) 648-6184
> US Geological Survey fax: (703) 648-6383
> 954 National Center
> Reston, VA 20192, USA
>
>
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Received on Tue 20 Mar 2007 11:41:22 AM PDT