NWA 8172 Ureilite 9.61g Slice of Olivine-Pigeonite Achondrite

Description

Item for auction is a
9.61g
slice of my NWA 8172 ureilite meteorite that I bought in Morocco in September 2013 as a 334g lot of two stones. Dr Tony Irving analyzed the specimen and report it as a protogranular aggregate of olivine and pigeonite. Grain boundary regions have distinctive dark, reduced, metal-rich zones. Geochemistry consists of Olivine (cores Fa24.1; reduced rims Fa12.0), pigeonite (Fs19.6-19.7Wo7.6-8.0). Compared to most other meteorites, ureilites tend to have a high percentage of carbon (average 3% by weight) in the form of graphite and nanodiamonds. The diamonds, which are rarely more than a few micrometres in diameter, are probably the result of high pressure shockwaves produced by collisions of the ureilite parent body with other asteroids. This specimen comes in a quality labeled display case for protection and years of viewing pleasure, along with a Big Kahuna Meteorites Certificate of Authenticity. Scale cube is 1cm on each side and not included.
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