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Labenne's 97058 specimen

The Labenne's kindly wrote:

An other change concern the Sahara 97058. We have sold this as a H4 and now
it's a H3/4. A change is possible but we think that H3/4 is a better
classification that H4 !!


Hello Labennes and All,

I have a 35g complete slice of the Sahara 97058 specimen, and when it
arrived I was surprised by the clarity and density of chondrules
considering it was an H4. The specimen also appears have some "swirling"
effects of which I cannot explain.

The 'swirl' resembles (but not as obvious as) some features I have seen in
the Cat Mountain impact breccia. The 'swirl' appears to flow(?) around the
center of the slice making a roughly circular feature of about 35mm in
diameter. The flow is visible through the following features combining to
make the circular 'swirl' in the slice: chondrule elongation, short arcs of
inclusions, some color changes, metal veining, shock veins, and even a few
small cracks.

A change from H4 to H3/4 explains some of the chondrule appearance, but I
would like to know if other who possess this same locality sees similar
'swirl'  or 'flow' features. If so, are there any guesses as to what caused
this effect?

The 97058 specimen has been one of the most pleasantly surprising and
enjoyable specimens I have acquired this year.

Sincerely,

Martin
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