[meteorite-list] Let's talk HEDO meteorites (was double standards)

From: Martin Altmann <altmann_at_meteoritecentral.com>
Date: Sun, 14 Nov 2010 23:27:22 +0100
Message-ID: <004901cb844b$1ba653d0$52f2fb70$_at_de>

Hi Mike,

that concerns the polymict breccias among the HEDs, those wild regoliths,
full of fragments and clasts of different types, so to say.
Often these concrete-style ones. Hence not such ones like Millbillillie,
Stannern, Tatahouine ect.

There with these solified debris breccias you have a continuum.
If such a HED-breccia has less than 10% diogenitic stuff, then by convention
it's a polymict eucrite,
If it has more than 10%, it will be classified as Howardite.
Contains such a breccias more than 90% hypersthene or orthopyroxene than
it's called a polymict diogenite.

So it can happen, if you cut by chance off a corner from a polymict eucrite,
with especially much DIO-stuff inside, and hand that in for classification,
it can happen, that it will be classified as HOW.

A classifier can work only on the material he gets in for classification.
Therefore it can be helpful, if the person suspect the material to be paired
with another one (or if he's sure and knows exactly that it's the very same
material of an already existing number) to tell to the classifier his
opinion.

Best!
martin



-----Urspr?ngliche Nachricht-----
Von: meteorite-list-bounces at meteoritecentral.com
[mailto:meteorite-list-bounces at meteoritecentral.com] Im Auftrag von Galactic
Stone & Ironworks
Gesendet: Sonntag, 14. November 2010 22:00
An: Ted Bunch
Cc: meteorite-list at meteoritecentral.com
Betreff: [meteorite-list] Let's talk HEDO meteorites (was double standards)

Hi Folks,

This post is not about - divining rods, missile contrails, aliens, or spam.
:)

I want to ask the experts about something regarding eucrites,
diogenites and howardites.

I know the fine line between eucrites and howardites is a little
nebulous at times. For example, let's say I have a slice of howardite
and a piece breaks off. That broken-off piece may either be a eucrite
or a howardite, depending on the ratio of components. So, if I have a
howardite, and I break off a portion that does not have any howardite
components, then that piece could be classified on it's own as a
eucrite.

So I always expect a little overlap when it comes to the HE. members
of the HEDO(D) group.

When I encountered NWA 6288 and NWA 6386, I was perplexed. NWA 6386
comes from Gary Fujihara and it is classified as a diogenite. NWA
6288 comes from John Higgins and it was classified as a eucrite. Ray
Pickard classified 6386 and Tony Irving classified 6288.

What's the problem? They are the same meteorite. I sliced and
polished samples of both meteorites from both dealers, and I can say
with near-certainty they are from the same find. They are identical
in texture, aesthetic, and how they respond to cutting and polishing.
I know I am engaging in self-pairing here, but if someone wants to bet
pink-slips with me on this question, I'll gladly take the bet. They
are one and the same.

But wait, it's gets more interesting!

Enter NWA 6293 - a diogenite from Peter Marmet. It was also
classified by Tony Irving. And it is also the same as NWA 6288 and
6386. Interestingly, Irving classified both 6293 and 6288 - one as
diogenite and one as eucrite. So we have three samples from one find
(in all likelihood) with two different classifications.

As it was explained to me, the difference in these classifications was
based on the chemical composition of the samples and that there were
distinct differences not apparent to the layman or visual comparison.

So, have diogenites now joined the sometimes-confusing mixture of
eucrites and howardites as overlapping classifications? Are there
other examples of diogenites/eucrites like this one?

Best regards,

MikeG

----------------------------------------------------------------------
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On 11/14/10, Ted Bunch <tbear1 at cableone.net> wrote:
> Inane is a polite term.
>
> Ted
>
>
> On 11/14/10 12:48 PM, "Elizabeth Warner" <ewarner at umd.edu> wrote:
>
>> Maybe you are getting more email than I am from the list, but I don't
>> see any messages from Eric today (Sun 14 Nov), just 1 from yesterday
>> (Sat 13 Nov)... Can't say about Wednesday because I don't have messages
>> going that far back saved on my computer...
>>
>> So, no, I have not noticed that happening.
>>
>> I have noticed lots of list members B___ing about the most inane things
>> on occasion though.
>>
>> Clear Skies!
>> Elizabeth
>>
>>
>> On 11/14/2010 2:33 PM, pshugar at messengersfromthecosmos.com wrote:
>>> Hello List,
>>>
>>> I have been watching something that has been happening for quite
>>> some time now.
>>>
>>> In the past there were many complaints re several list members
>>> that were very prolific posters to the list with several to many
>>> posts every day, mostly posting ads as well as corrections to the
>>> ads. Many of the list members got quite irate at them for their
>>> posts.
>>>
>>> There exists on the list today one who does this, but yet there is no
>>> outcry. He continues to make several posts everyday and I loose count
>>> of the number of ads per week that are posted by this individual.
>>>
>>> There were nine posts on Wendsday and today there were 4 posts from
>>> 12:30 (Approx) to not quite 2:30 pm, just under 2 hours.
>>>
>>> Does Eric enjoy a protected position on this list such that he is
>>> allowed
>>> to post at will whenever he feels the urge to do so???????
>>>
>>> I find I no longer care to check my email, for fear of clogging my
>>> computer
>>> with yet more ads.
>>>
>>> Does anyone else notice this happening?????
>>> Pete
>>> IMCA 1733
>>>
>>> ______________________________________________
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>
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-- 
----------------------------------------------------------------------
Mike Gilmer - Galactic Stone & Ironworks Meteorites
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Received on Sun 14 Nov 2010 05:27:22 PM PST