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Northwest Africa 12804
Basic information Name: Northwest Africa 12804
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12804
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 1200 g
Classification
  history:
Meteoritical Bulletin:  MB 108  (2020)  LL7
Recommended:  LL7    [explanation]

This is 1 of 68 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 15 Dec 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12804 (NWA 12804)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (LL7)

History: The meteorite was purchased from a local meteorite dealer in Algeria.

Physical characteristics: Dark-grayish rock with some fusion crust.

Petrography: The meteorite displays a thoroughly recrystallized texture of dominantly olivine and orthopyroxene grains with relativey high Wo-contents. Plagioclase grains are up to 150 μm in size. One relict chondrule fragment has been found in the 1 × 1.5 cm section.

Classification: Petrologic type 7 based on the equilibrated state of olivine and pyroxene, the large grain size of secondary plagioclase, and the high CaO concentration in low-Ca pyroxene.


Writeup from MB 108:

Northwest Africa 12804 (NWA 12804)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (LL7)

History: The meteorite was purchased from a local meteorite dealer in Algeria.

Physical characteristics: Dark-grayish rock with some fusion crust.

Petrography: The meteorite displays a thoroughly recrystallized texture of dominantly olivine and orthopyroxene grains with relativey high Wo-contents. Plagioclase grains are up to 150 μm in size. One relict chondrule fragment has been found in the 1 × 1.5 cm section.

Classification: Petrologic type 7 based on the equilibrated state of olivine and pyroxene, the large grain size of secondary plagioclase, and the high CaO concentration in low-Ca pyroxene.


Writeup from MB 108:

Northwest Africa 12804 (NWA 12804)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (LL7)

History: The meteorite was purchased from a local meteorite dealer in Algeria.

Physical characteristics: Dark-grayish rock with some fusion crust.

Petrography: The meteorite displays a thoroughly recrystallized texture of dominantly olivine and orthopyroxene grains with relativey high Wo-contents. Plagioclase grains are up to 150 μm in size. One relict chondrule fragment has been found in the 1 × 1.5 cm section.

Classification: Petrologic type 7 based on the equilibrated state of olivine and pyroxene, the large grain size of secondary plagioclase, and the high CaO concentration in low-Ca pyroxene.

Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Algeria
Date:P 2018
Mass (g):1200
Pieces:1
Class:LL7
Shock stage:S2
Weathering grade:W1
Fayalite (mol%):28.3±0.2 (n=11)
Ferrosilite (mol%):23.4±0.3 (n=13)
Wollastonite (mol%):3.4±0.2 (n=13)
Classifier:A. Greshake, MNB
Type spec mass (g):33.4
Type spec location:MNB
Main mass:Marcin Cimala
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Marcin Cimala      
Woreczko Jan & Wadi      
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7483 approved meteorites from (Northwest Africa) (plus 1994 unapproved names)

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