[meteorite-list] Meteorite Picture of the Day (Belle Plaine)

From: Impactika at aol.com <Impactika_at_meteoritecentral.com>
Date: Wed, 2 Nov 2011 15:41:36 -0400 (EDT)
Message-ID: <3d156.445386d5.3be2f6f0_at_aol.com>

Since you all asked................
 
Here is a close-up of that chondrule, and I do believe it is a chondrule.
 
_http://www.impactika.com/catpix/bplainex.jpg_
(http://www.impactika.com/catpix/bplainex.jpg)
 
And Bernd, your estimate was very close, it is not quite round, so it is 15
mm across at the narrowest point and 17mm across at the widest.
 
And Thank you Art Ehlmann for allowing me to present this great piece to
the world! ;-)
(BTW, it is for sale, as a fund-raiser for the Monnig Collection).
 
Anne M. Black
_http://www.impactika.com/_ (http://www.impactika.com/)
_IMPACTIKA at aol.com_ (mailto:IMPACTIKA at aol.com)
Vice-President, I.M.C.A. Inc.
_http://www.imca.cc/_ (http://www.imca.cc/)
 
 
In a message dated 11/2/2011 8:46:37 AM Mountain Daylight Time,
bernd.pauli at paulinet.de writes:
Mirko wrote:

"Wow, what a large chondrule in this Belle
Plaine piece! How large is this chondrule?"

Truly amazing! Thanks for sharing with us!

Judging from the scale cube, I'd say: the diameter is about 16 mm
thus making it a real "macrochondrule" according to J.C.Bridges
and the late R. Hutchison:

J.C. BRIDGES et al. (1997) A survey of clasts and large chondrules
in ordinary chondrites (Meteoritics 32-3, 1997, 389):

"The macrochondrules were classified on the criteria of having diameters
prior to sectioning of > 5 mm and the same mineral chemistry and internal
textures as normal-sized chondrules."

Best wishes,

Bernd
Received on Wed 02 Nov 2011 03:41:36 PM PDT