header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 17 Jun 2019
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Include past classifications in search
Limit to approved meteorite names
Search text:  
Northwest Africa 12534
Basic information Name: Northwest Africa 12534
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12534
Observed fall: No
Year found: 2018
Country: Algeria
Mass:help 24 g
Classification
  history:
Recommended:  LL7    [explanation]

This is 1 of 59 approved meteorites classified as LL7.   [show all]
Search for other: LL chondrites, LL chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 27 Mar 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12534 (NWA 12534)

Algeria

Find: 2018

Classification: Ordinary chondrite (LL7)

History: Purchased in September 2018 by Matthew Stream and Kenneth Stream from Didi Baidari, who had purchased it previously from an anonymous dealer in March 2018 in Algeria.

Physical characteristics: Dark brown stone with weathering veins around the exterior.

Petrography: (Daniel Sheikh, FSU) Poikiloblastic texture with no chondrules. Microprobe examination of a polished section shows 70% olivine, 12% low-ca pyroxene, 10% ca-pyroxene, 4% sodic plagioclase, 3% troilite, 1% chromite.

Geochemistry: Olivine, Fa29.4±0.7, N=16; orthopyroxene, Fs23.8±0.6W 2.9±0.6, N=8. Sodic plagioclase, An10±1, N=7. Oxygen isotopes (K. Ziegler, UNM): analyses of acid-washed subsamples by laser fluorination gave, respectively, δ17O 4.075, 4.009, 3.988; δ18O 5.462, 5.345, 5.288; Δ17O 1.191, 1.187, 1.196 per mil.

Classification: Ordinary Chondrite (LL7). Completely recrystallized with no chondrules, Fa range and O isotopes consistent with LL.

Specimens: 5.03 grams at UCLA; main mass with Matthew Stream and Kenneth Stream.

Data from:
  MB108
  Table 0
  Line 0:
Date:2018
Mass (g):24
Pieces:1
Class:LL7
Shock stage:S3
Weathering grade:W3
Fayalite (mol%):29.4±0.7 (N=16)
Ferrosilite (mol%):23.8±0.6 (N=8)
Wollastonite (mol%):2.9±0.6 (N=8)
Classifier:Daniel Sheikh, FSU
Type spec mass (g):5.03
Type spec location:UCLA
Main mass:Matthew Stream and Kenneth Stream
Comments:Submitted by Daniel Sheikh
Plots: O isotopes:  
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Sheikh      
Geography:

Algeria
Coordinates:Unknown.

Statistics:
     This is 1 of 961 approved meteorites from Algeria (plus 26 unapproved names) (plus 4 impact craters)

Direct link to this page