header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 2 Aug 2020
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:
Limit to approved meteorite names
Search text:  
Northwest Africa 11907
Basic information Name: Northwest Africa 11907
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 11907
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 1327 g
Classification
  history:
Meteoritical Bulletin:  MB 107  (2018)  LL3
Recommended:  LL3    [explanation]

This is 1 of 342 approved meteorites classified as LL3.   [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 24 Jul 2018
Writeuphelp
Writeup from MB 107:

Northwest Africa 11907 (NWA 11907)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (LL3)

History: Darryl Pitt purchased from Said Haddany at the Tucson Gem and Mineral Show in January 2018

Physical characteristics: Single stone with fusion crust. Saw cut reveals two distinct lithologies, one lighter and one darker in color. Numerous well formed, closely packed chondrules, some up to 2 mm in diameter. Average apparent chondrule diameter is 750±450 μm (n=16). Scattered metal/sulfide grains observed.

Petrography: (C. Agee, UNM) Microprobe examination shows many porphyritic chondrules in both lithologies, most with mesostasis and glass.

Geochemistry: (C. Agee,UNM) All olivine Fa27.2±10.5, n=42; all low-Ca pyroxene Fs23.6±8.3Wo0.9±0.5, n=12. Dark lithology: olivine Fa22.1±11.4, Cr2O3=0.11±0.16, Fe/Mn=51±17, n=21; low-Ca pyroxene Fs18.2±0.2Wo1.1±0.8, Fe/Mn=21±1, n=6. Light lithology: olivine Fa32.4±6.3, Cr2O3=0.05±0.08, Fe/Mn=66±13, n=21; low-Ca pyroxene Fs29.2±3.2Wo1.1±0.5, Fe/Mn=46±11, n=6.

Classification: Ordinary chondrite (LL3), estimated sub-type LL3.2-3.3 based on mean Fa content of olivine and the 1-sigma Fa content of olivine, and on mean Cr2O3 content of ferroan olivine and the 1-sigma Cr2O3 content of ferroan olivine (Grossman and Brearley, 2005). Similar to St. Marys County (LL3.3), GRO 95502 (L3.2) and GRO 95544 (L3.2).

Specimens: 22.7 g on deposit at UNM, MMGM holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB107
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2018
Mass (g):1326.7
Pieces:1
Class:LL3
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):27.2±10.5
Ferrosilite (mol%):23.6±8.3
Wollastonite (mol%):0.9±0.5
Classifier:C. Agee, UNM
Type spec mass (g):22.7
Type spec location:UNM
Main mass:MMGM
Comments:MVCH-332; submitted by C. Agee, UNM
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
MMGM: Maine Mineral and Gem Museum, PO Box 500, 99 Main St., Bethel, ME 04217, United States; Website (institutional address; updated 9 Jan 2020)
Catalogs:
References: Published in Meteoritical Bulletin, no. 107, MAPS 55, 460-462
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7354 approved meteorites from (Northwest Africa) (plus 1958 unapproved names)

Direct link to this page