JAH 626 (eucrite – DAWN Mission) – 5.65g


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5.65g part slice. Sold with label/certificate of authenticity. This shocked eucrite was used by NASA to calibrate the DAWN probe spectrometer which studied the Vesta asteroid.

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Jiddat al Harasis 626 (JaH 626)        19°47.09’N, 55°57.55’E

Al Wusta, Oman

Found: April 2010

Classification: HED achondrite (Eucrite, polymict)

Petrography: (A. Irving and S. Kuehner, UWS): Polymict breccia composed of both basaltic eucrite and cumulate eucrite clasts plus related debris. Pigeonite of various compositions (some exhibiting exsolution lamellae of clinopyroxene within orthopyroxene), calcic plagioclase, silica polymorph, chromite, troilite and rare zircon. Plagioclase has been transformed by shock into aggregates of fine anisotropic blades in a subspherulitic texture, indicative of quenching from melt.

Geochemistry: Low-Ca pigeonite (Fs32.1-39.3Wo6.3-5.1; FeO/MnO=29.5-31.2), clinopyroxene exsolution lamellae (Fs30.6-33.5Wo31.9-29.8; FeO/MnO=30.7-31.0), pigeonite (Fs51.8Wo12.7; FeO/MnO=30.8).


State/Prov/County: Al Wusta
Date: April 2010
Latitude: 19°47.09’N
Longitude: 55°57.55’E
Mass (g): 466
Pieces: 3
Class: Eucrite-pmict
Shock stage: high
Weathering grade: low
Ferrosilite (mol%): 32.1-39.3; 30.6-33.5; 51.8
Wollastonite (mol%): 6.3-5.1; 31.9-29.8; 12.7
Classifier: A. Irving and S. Kuehner, UWS
Type spec mass (g): 20.2
Type spec location: PSF
Main mass: F. Kuntz
Finder: F. Kuntz
Comments: Submitted by A. Irving