[meteorite-list] New Met Bulletin Approvals - Question about the "Tilde" ~

[Jeff Grossman]

Actually, there are hundreds of these from the last 5 years.  They are 
all equilibrated ordinary chondrites classified by magnetic 
susceptibility.  Because no thin section was prepared, the petrologic 
type is fairly uncertain.  Actually, if there is a lot of weathering, 
even the chemical group can be more uncertain than usual.

Jeff

On 11/6/2011 11:28 AM, Michael Gilmer wrote:
> Hi Gang,
>
> Several new meteorites were added to the Met Bulletin yesterday.  Many
> of these have something new I have never seen before.  There is a "~"
> (tilde) in the type.  For example -
>
> Acfer 393 (H~6) - obvious this means the petrologic type is
> "approximately" 6, but how/why is this being used in the nomenclature?
>   Were stones like this ambiguous in some way and the exact type could
> not be determined?  Or, is this some new naming convention we will see
> more of?
>
> Here is a link to the new meteorites -
> http://www.lpi.usra.edu/meteor/metbull.php?sea=%2A&sfor=names&ants=&falls=&valids=&stype=contains&lrec=50&map=ge&browse=&country=All&srt=name&categ=All&mblist=All&rect=&phot=&snew=2&pnt=Normal%20table&dr=&page=0
>
> All of them, except for two, have this tilde in the type.
>
> Best regards,
>
> MikeG
>
>
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