nwa8716
Northwest Africa 8716 (NWA 8716) Morocco Purchased: Dec 2014 Classification: Martian meteorite (Shergottite) Petrography: Olivine macrocrysts (up to 1.8 mm) and microphenocrysts (up to 420 μm) are set in a fine groundmass of patchily zoned pyroxene, maskelynite, chromite, troilite. Large olivine macrocrysts and some microphenocrysts show zoning with ferroan rims and magnesium cores. Other olivine microphenocrysts are relatively homogeneous and have higher Fe contents. Tiny chromite inclusions and melt inclusions are observed within olivine grains. Geochemistry: Olivine (cores of large macrocryst Fa16.9-22.1, rims Fa32.4-36.2, microphenocrysts Fa41.7-47.8) Fe/Mn=45.1-64.2; orthopyroxene (Fs18.2-21.4Wo2.2-4.4), pigeonite (Fs25-35.8Wo6.7-16.3), Fe/Mn=28.4-38.8; maskelynite (An58.7-65.7Ab40.7-34.1) Specimens: Olivine-phyric shergottite
Place of purchase: | Ouarzazate | Date: | P Dec 2014 | Mass (g): | 168 | Pieces: | 1 | Class: | Martian (shergottite) | Shock stage: | high | Fayalite (mol%): | 34.4±9.2 (n=40) | Ferrosilite (mol%): | 29.0±4.0 (n=22); 19.2±1.3 (n=6) | Wollastonite (mol%): | 10.8±2.4 (n=22); 3.2±1.1 (n=6) | Classifier: | Wu Y., PMO | Type spec mass (g): | 20 | Type spec location: | PMO | Main mass: | Ke Zuokai | Comments: | Submitted by Hsu W. |
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