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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:
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 Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9429 approved meteorites from (Northwest Africa) (plus 1876 unapproved names)

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