ello
I have a little to add too :-)
In my big NWA869 there are some of the "mysterious grey areas" that contain metal grains and some that do not.
Those witch contain metal grains seems to do that in the exact same way as the rest of the meteorite.
In one clast there is a funny one...
It looks like an armoured chondruls that has been cut in half and the two half's has been misplaced by a half centimetre, and more, it looks like the chondrule that was once there, is missing, and just leaving the armoured border ???
Metal grains in achondrittic material......no ???
Best wishes
Lars Pedersen
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Sent: Sunday, September 19, 2004 2:53 PM
Subject: [meteorite-list] Achondritic inclusions
Phil wrote:
I've been curious about a piece of NWA 869 I cut into and am interested in opinions or observations.
Bernd mentioned "achondritic" gray inclusions more than a year ago ... and Maria just showed a slice containing a couple of them.
Is this a large half-baked chondrule or one of these achondritic inclusions of some sort.
Hello Phil and List,
Let me first of all say that your slice is a wonderful example of the many different looks NWA 869 specimens surprise us with!
The lower part of your slice looks very much like L3.x or LL3.x material (no surprise as we all know that even L3.8 has been proposed for some NWA 869 lithologies).
Those large mineralic clasts look like pyroxene or (especially the one on the right) like a mixture of pyroxene and olivine to me. The possibly achondritic material I was talking about in my post about a year ago, can be seen in O.R. Norton's ENCYCLOPEDIA, p. 144 (lower picture).
This fine-grained material - so fine-grained that it remains featureless even under the microscope - is, according to O.R. Norton (p. 144), typical of basaltic achondrites.
I am going to send you, Christian, and Maria, (the 869 fan club :-) a
JPEG of such an inclusion in one of my NWA 869 specimens (purchased from
Dean Bessey) in a private mail so you get a first-hand impression of what
I was talking about. It is the gray, featureless area in the 9 o'clock position
of the 30.8-gram piece on the left.
Best regards,
Bernd
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