June 2012

IMCA Insights – June 2012

The meteorite de Monferre (France) By Jean-Michel Masson Translated by Anne Black Late in the evening probably around 10pm, during the summer of 1923, the inhabitants of the village of Treville in southwest France between Toulouse and Carcassonne observed a large fireball crossing the sky. The bolide was lying from south to north and passed just east of the village.

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Angrites

Angrites are achondrites consisting largely of augite.  Augite is a pyroxene containing calcium and, in this case, some titanium and aluminum.  Olivine and plagioclase make up the remaining bulk.  Angrites are among the oldest known igneous rocks and probably came from a large parent body. Here are four photos each of three different angrites D’Orbigny   NWA 2999 and a

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Georgiaite Teardrop

This particularly fine Georgiaite teardrop is pictured in two Georgia mathematics textbooks. It was found January 25, 2003 near Riddleville, Washington County, Georgia, almost exactly 500 miles southwest of the generally accepted 34.5 ma impact site in what is now Chesapeake Bay, Virginia. A little over 2000 Georgiaites are known with a total weight in the neighborhood of 12 kg.

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Interesting Indochinite Tektites by Phil Morgan

Stretched Teardrop This Indochinite teardrop weighs 15.7g and measures 25 x 50 mm.  The bottom 1/3 on one side broke away and almost slid off, stretching the still-soft interior. Some might not consider this a true “stretch” tektite since there is only relatively minor angular distortion but this is far from a simple skin split. I have had a couple

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