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Grading, was Re: Meteorites-do you sell your loved ones?
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- Subject: Grading, was Re: Meteorites-do you sell your loved ones?
- From: Jim Hurley <email@example.com>
- Date: Sat, 11 Jul 1998 14:57:16 -0700
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Kevin brings up some interesting points about grading.
I wish every dealer had high-grade digital photos of
all specimens that were above average in quality.
I don't mind spending more for high quality, but I feel
a bit annoyed to get a specimen that doesn't display
properties that are representative of the type - for
example, as Kevin says, a Allende specimen should
exhibit CAI's, and an impact melt should show signs
of impact and melting, by all means sell me a brecciated
specimen, but hey, where's the brecciation? Just what does
oriented with flow lines mean? Shouldn't it be round?
Sometimes I feel that dealers are the only ones that get the best stuff,
that I should become a dealer, buy a few kilos, keep the
one best specimen for myself, and sell the rest. My collection
would be free because the markup would pay for what I keep.
This kind of behavior should only be justified if I offered
some service of value in exchange - such as that pictorial
catalog I mentioned.
Many dealers do have images but some are pretty hard to see
because they've been compressed too much or taken under
poor conditions, etc.
I understand how difficult this is to do, updating catalogs
on the web is time-consuming. But, would you buy a diamond ring
based on a text description?
Here is a grade guide that I propose as a start - I only spent
a minute on it and it's incomplete - it's dufficult to be
complete and cover all the issues - this grading scale focusses
only upon appearances, deterioration will tend to lower grades over time.
For individuals For slices
Grade A+ - 100% fusion crust, oriented
Grade A - 100% fusion crust edge is fully crusted
no chips displays all properties of its type
Grade B - 90% fusion crust displays most properties of its type
some rusting of metal
Grade C ...
Grade D fragment, no crust
Grade E waethered, rusted fragment
> We've all purchased
> specimens that weren't Grade "A" although we paid a good price.
> Poor slicing, the wrong lubricant that
> led to the specimen "bleeding", and not much elbow grease going into the
> Don't tell me that a specimen of
> tired Allende w/o a CAI in sight is worth the same as a piece with a
> brilliant, white CAI and primary and secondary crust.
> Everything collectible that I can
> think of is sold by graded condition. We need to start becoming more
> critically descriptive in our marketing.
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