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Northwest Africa 15285
Basic information Name: Northwest Africa 15285
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15285
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 8.33 kg
Classification
  history:
Meteoritical Bulletin:  MB 111  (2023)  LL4/5
Recommended:  LL4/5    [explanation]

This is 1 of 9 approved meteorites classified as LL4/5.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 14 Sep 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 15285 (NWA 15285)

(Northwest Africa)

Purchased: January 2021

Classification: Ordinary chondrite (LL4/5)

History: A single stone of 8.333 kg was purchased from Topher Spinnato by Pat Brown at Quartzite Arizona in January of 2021.

Physical characteristics: Stone contains a dark-brown, weathered fusion crust.

Petrography: (D. Sheikh, Cascadia; P. Brown, MeteoriticsLab) Sample is an ordinary chondrite containing well-defined chondrules (Av. 1320±50 μm) set within a fine-grained matrix containing accessory Fe-Ni metal and troilite.

Geochemistry: Olivine (Fa27.2±0.1, range Fa26.9-27.5, n=19), Low-Ca Pyroxene (Fs22.3±0.2Wo1.9±0.1, range Fs22.1-22.8Wo1.6-2.0, n=16).

Classification: Ordinary Chondrite (LL4/5). Many well rounded chondrules containing devitrified glass are preserved, yet their olivine and pyroxene compositions are completely equilibrated across the entire sample. This suggests a transitional classification of LL4/5.

Specimens: 104 g at Cascadia, main mass with Pat Brown.

Data from:
  MB111
  Table 0
  Line 0:
Place of purchase:Arizona
Date:P January 2021
Mass (g):8333
Pieces:1
Class:LL4/5
Shock stage:S2
Weathering grade:W3
Fayalite (mol%):27.2±0.1
Ferrosilite (mol%):22.3±0.2
Wollastonite (mol%):1.9±0.1
Classifier:D. Sheikh, Cascadia; P. Brown, MeteoriticsLab
Type spec mass (g):104
Type spec location:Cascadia
Main mass:Pat Brown
Comments:CML 1556; submitted by Daniel Sheikh
Institutions
   and collections
Cascadia: Cascadia Meteorite Laboratory, Portland State University, Department of Geology, Room 17 Cramer Hall, 1721 SW Broadway, Portland, OR 97201, United States; Website (institutional address; updated 28 Oct 2011)
Catalogs:
References: Published in Gattacceca J., McCubbin F. M., Grossman J. N., Schrader D. L., Chabot N. L., D’Orazio M., Goodrich C., Greshake A., Gross J., Joy K. H., Komatsu M. and Miao B. (2023) The Meteoritical Bulletin, No. 111. Meteoritics & Planetary Science 58, 901–904. ?
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Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9790 approved meteorites from (Northwest Africa) (plus 1854 unapproved names)

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