Re-2: [meteorite-list] Tiny Bubbles in NWA 1817

From: bernd.pauli_at_paulinet.de <bernd.pauli_at_meteoritecentral.com>
Date: Thu Apr 22 10:32:52 2004
Message-ID: <DIIE.0000004000001C78_at_paulinet.de>

> here is a link to a different site that should work.

> http://my.execpc.com/~eagle1/

Hello Don and List,

Thank you, this one works. Yes, that tiny bubble is an interesting
feature. The description of NWA 1817 in the Meteoritical Bulletin
also mentions the presence of a "silica polymorph". Maybe this
bubble is such a SiO2 polymorph.

That dark clast/inclusion itself is an interesting feature because it
looks highly crystalline. Maybe it is highly shocked and thus shock-
darkened. This mesosiderite also contains anorthitic plagioclase
and the "transformation product" of plagioclase that underwent
intense shock pressure is maskelynite which is colorless and clear.

Best wishes,

Bernd

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Received on Sun 21 Mar 2004 05:15:27 AM PST