[meteorite-list] Johnstown Diogenite or similar materials

[Hiromi Konishi]

Hello,
I am looking for Johnstown Diogenite or similar materials whose
orthopyroxene may contain GP zone. GP zone is a kind of exsolved
precipitates that only have one or several units. It was found in
lunar meteorites and plutonic rocks (such as Webster-Addie alpine
ultramafic rock). GP zone will be found in rocks or meteorites with a
very slow cooling history. I could not find GP zones in Tatahouine
diogenite, but perhaps diogenites are good candidate contains GP zone.

 I want to look at the GP zone using STEM. If you have good samples,
please email me the detail and price. I need fragments or thin
sections. I need to make [001] cross sections of orthopyroxene for
STEM observations.

References

Nord 1980 The Composition, Structure, and Stability of Guinier-Preston
Zones in Lunar and Terrestrial Orthopyroxene. Phys. Chem. Minerals 6,
109 128.

Langenhorst et al., 2006 On the nature of Guinier-Preston zones in
meteoritic and lunar orthopyroxene. Lunar and Planetary Science
XXXVII.

Best Wishes,

Hiromi Konishi
Dept of Geology, Niigata University