66.9 gram - NWA 13917 - RARE WINONITE METEORITE - "LIGHTNING BOLT" IRON VEINS

Description

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About this particular meteorite from the Meteoritical Bulletin
Northwest Africa 13917
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:
Recommended:
Winonaite
This is 1 of 57 approved meteorites classified as Winonaite.
Comments:
Approved 6 May 2021
Writeup
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 Fa
4.0±0.0
, Fe/Mn=16±0, n=2; enstatite Fs
4.7±0.2
Wo
1.9±0.2
, Fe/Mn=13±1, n=3; diopside Fs
1.3±0.4
Wo
44.8±0.3
, Fe/Mn=13±7, n=4. Oxygen isotopes (K. Ziegler,
UNM
): 3 acid-washed fragments analyzed by laser fluorination gave δ
18
O=4.959, 5.107, 5.236; δ
17
O=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.