FABULOUS NWA 13917 METEORITE!!!
RARE WINONAITE WITH LOTS OF FRESH METAL!!!
SENSATIONAL ETCHED METAL SLICE!!!
TOTAL KNOWN WEIGHT: 5.2 KILOS!!!
DIMENSIONS: 104.7 MM X 71.3 MM X 2.6 MM
SPECIMEN WEIGHT: 53 GRAMS!!!
| Northwest Africa 13917 | |||||||||||||||||||||||||||||||
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| Basic information | Name: Northwest Africa 13917 This is an OFFICIAL meteorite name. Abbreviation: NWA 13917 Observed fall: No Year found: 2020 Country: (Northwest Africa) Mass: 5.2 kg | ||||||||||||||||||||||||||||||
| Classification history: |
This is 1 of 69 approved meteorites classified as Winonaite. | ||||||||||||||||||||||||||||||
| Comments: | Approved 6 May 2021 | ||||||||||||||||||||||||||||||
| Writeup | Writeup from MB 110: Northwest Africa 13917 (NWA 13917) (Northwest Africa) Purchased: 2020 Classification: Primitive achondrite (Winonaite) History: Purchased from Morocco in September 2020 and January 2021. Physical characteristics: Several identical appearing stones found together -- the largest of which are individuals weighing 1.6 kg, 1.4 kg, and 1.2 kg. Saw-cut surface shows abundant fine-grained metal and sulfide set in a mosaic of brown and gray silicate minerals. A prominent metal vein 2 mm thick and several cm in length crosscuts the deposit sample slice. Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows a texturally equilibrated mosaic of enstatite and diopside with grain size in the range 100-300 μm, many triple junctions are present. Forsterite is ubiquitous but is significantly less abundant than the pyroxenes. Kamacite, taenite, and troilite make up approximately 10% of this meteorite, most grains are 100-300 μm in diameter. A phosphate phase was detected. No feldspar was observed in the microprobe mount. Geochemistry: (C. Agee UNM) Forsterite Fa4.0±0.0, Fe/Mn=16±0, n=2; enstatite Fs4.7±0.2Wo1.9±0.2, Fe/Mn=13±1, n=3; diopside Fs1.3±0.4Wo44.8±0.3, Fe/Mn=13±7, n=4. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O=4.959, 5.107, 5.236; δ17O=2.055, 2.179, 2.232; Δ17O=-0.563, -0.518, -0.533 (linearized, all per mil, TFL slope=0.528). Classification: Primitive achondrite (Winonaite) Specimens: 67.9 g on deposit at UNM. Mark Lyon holds the main masses. | ||||||||||||||||||||||||||||||
| Data from: MB110 Table 0 Line 0: |
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