On Offer: 184.53 gram specimen of the winonaite NWA 13917 primitive achondrite meteorite

Class: Winonaite

Origin: Western Sahara

Official name: NWA 13917

Description: 184.53 gram Primitive Achondrite Winonaite Meteorite NWA 13917. The primitive achondrites are thought to represent a transitional phase between chondrites and achondrites.

What you get: 184.53g Winonaite Meteorite NWA 13917 as shown, and signed Certificate of Authenticity.

I offer a 100% no questions asked 30 day .

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Northwest Africa 13917Basic informationName: 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:Recommended: Winonaite
This is 1 of 78 approved meteorites (plus 1 unapproved name) classified as Winonaite.

Comments:Approved 6 May 2021Writeup
Writeup from MB110 :

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 m, 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 m in diameter. A phosphate phase was detected. No feldspar was observed in the microprobe mount.

Geochemistry: (C. Agee UNM) Forsterite Fa 4.0 0.0, Fe/Mn=16 0, n=2; enstatite Fs 4.7 0.2Wo 1.9 0.2, Fe/Mn=13 1, n=3; diopside Fs 1.3 0.4Wo 44.8 0.3, Fe/Mn=13 7, n=4. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave 18O=4.959, 5.107, 5.236; 17O=2.055, 2.179, 2.232; 17O=-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:Place of purchase:MoroccoDate:P 2020Mass (g):5.2 kgPieces:severalClass:WinonaiteShock stage:lowWeathering grade:moderateFayalite (mol%):4.0 0.0Ferrosilite (mol%):4.7 0.2, 1.3 0.4Wollastonite (mol%):1.9 0.2, 44.8 0.3Classifier:C. Agee, UNMType spec mass (g):67.9Type spec location:UNMMain mass:Mark LyonComments:Submitted by C. AgeePlots:O isotopes: Institutions
and collectionsUNM: Institute of Meteoritics MSC03 2050 University of Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
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Product Attributes:

Weight (lbs.): 0.50 lb

Length (in.): 12

Width (in.): 10

Height (in.): 3