Description
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 |
