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47.5g Mesosiderite - A3 Meteorite slice I NWA 14518
Top Meteorite
- $646.00
On Offer: 47.5 gram NWA 14518 Mesosiderite, group A3, meteorite slice.
Dimensions: 119.36mm x 78.69mm x 2mm
Name: Northwest Africa 14518
Abbreviation: NWA 14518
Class: Mesosiderite - A3
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Description: 47.5 gram slice of NWA 14518 Mesosiderite meteorite.
What you get: 47.5 gram NWA 14518 Mesosiderite stoney-iron meteorite slice as shown, storage/shipping membrane box, and Certificate of Authenticity.
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Northwest Africa 14518
Status: Official
| Basic information |
Name: Northwest Africa 14518 This is an OFFICIAL meteorite name. Abbreviation: NWA 14518 Observed fall: No Year found: 2021 Country: (Northwest Africa) Mass: 3.1 kg |
|---|---|
| Classification history: |
Meteoritical Bulletin, MB 110 (2022): Mesosiderite-A3 Recommended: Mesosiderite-A3 This is 1 of 20 approved meteorites classified as Mesosiderite-A3. Search for other: Class A mesosiderites, Mesosiderites, and Metal-rich meteorites |
| Comments: | Approved 15 Dec 2021 |
| Writeup | Writeup from MB 110: Northwest Africa 14518 (NWA 14518) (Northwest Africa) Purchased: 2021 Classification: Mesosiderite (group A3) History: Purchased from a Moroccan meteorite dealer in 2021. Physical characteristics: Single object with irregular, dark gray-brown exterior. Saw cut reveals numerous irregular metal domains >1 mm, but also abundant fine-grained metal, distributed uniformly throughout a silicate groundmass. Petrography: (A. Ross and C. Agee, UNM) Microprobe examination of a polished mount shows pyroxene making up approximately 75% of the silicate portion of this meteorite, ~25% plagioclase, with ~5% minor phases silica, ilmenite, merrillite, chromite, rutile, and troilite. Some pyroxene grains have exsolution lamellae. Plagioclase is often poikilitically enclosed in larger pyroxene grains; no was olivine detected. Metal makes up approximately 35% of this meteorite and is primarily segregated into irregular ameboid domains >1 mm, although there are scattered smaller (~10 ?m) grains throughout the silicate domains. Both kamacite and taenite are present. No brecciation observed. Geochemistry: (A. Ross, UNM) Low-Ca pyroxene Fs31.5±1.3Wo4.3±0.51, Fe/Mn=26±1, n=4; high-Ca pyroxene Fs17.7±0.9Wo37.4±1.6, Fe/Mn=23±1, n=3; plagioclase An88.4±2.0Ab11.0±1.9Or0.6±0.2, n=6; kamacite Fe=93.7±0.2, Ni=6.5±0.2, Co=0.49±0.02 (wt%), n=3; taenite Fe=49.2±2.5, Ni=50.4±2.2, Co=0.07±0.02 (wt%), n=3 Classification: Mesosiderite-A3. Relatively high abundance of plagioclase and silica consistent with group A. Segregated metal, presence of some texturally and chemically equilibrated silicates, and absence of significant brecciation consistent with type 3. Specimens: 47.1 g on deposit at UNM, Craig Zlimen and Brett Joseph Cohen hold the main mass. |
| Data from: MB110 Table 0 Line 0: |
Place of purchase: Morocco Date: P 2021 Mass (g): 3.1 kg Pieces: 1 Class: Mesosiderite (group A3) Shock stage: low Weathering grade: moderate Ferrosilite (mol%): 31.5±1.3, 17.7±0.9 Wollastonite (mol%): 4.3±0.5, 37.4±1.6 Classifier: C. Agee, UNM Type spec mass (g): 47.1 Type spec location: UNM Main mass: Craig Zlimen and Brett Joseph Cohen Comments: Field name ZLI-038; submitted by C. Agee |
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