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Northwest Africa 1808
Basic information Name: Northwest Africa 1808
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1808
Observed fall: No
Year found: 2002
Country: (Northwest Africa)
Mass:help 684 g
Classification
  history:
Meteoritical Bulletin:  MB 91  (2007)  H5-imp melt breccia
Recommended:  H5-melt breccia    [explanation]

This is 1 of 17 approved meteorites classified as H5-melt breccia.   [show all]
Search for other: H chondrites, H chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 28 Mar 2007
Writeuphelp
Writeup from MB 91:

Northwest Africa 1808

Northwest Africa

Find: 2002

Ordinary chondrite (H5), impact-melt breccia

History: M. Chinellato purchased this dark brown stone in Erfoud, Morocco.

Physical characteristics: The 684 g mass has no fusion crust and a large metal vein on the surface. A cut surface on the type specimen displays areas with a marked difference in the amount of metal and seems to be composed of two different portions: a fine-grained one and a coarse-grained one.

Petrography: (V. Moggi Cecchi and G. Pratesi, MSP) In thin section, the fine-grained part shows a recrystallization texture with a few grains of residual metal and olivine in a matrix of feldspathic glass containing very fine-grained olivine and pyroxene crystals. Abundant dark portions, numerous cracks, and microfaults are also present. The coarse-grained portion presents a typical chondritic texture: major phases are olivine and orthopyroxene, metal and troilite.

Mineral composition and geochemistry: Olivine (Fa19), low-Ca pyroxene (Fs16.3En82.0Wo1.7), feldspathic glass (An17.6Ab77.5Or4.9).

Classification: Ordinary chondrite (H5), impact-melt breccia; S3, W0.

Type specimen: A total of 20.1 g and one thin section are on deposit at MSP (inventory number MSP 2334). MChin holds the main mass.

Data from:
  MB91
  Table 2
  Line 61:
Place of purchase:Erfoud, Morocco
Date:2002
Mass (g):684
Pieces:1
Class:H5 (IMB)
Shock stage:S3
Weathering grade:W0
Fayalite (mol%):19
Ferrosilite (mol%):16.31
Classifier:V. Moggi Cecchi and G. Pratesi, MSP
Type spec mass (g):20.1
Type spec location:MSP
Main mass:MChin
Institutions
   and collections
MSP: Museo di Scienze Planetarie, Via Galcianese 20/H, 59100 Prato, Italy, Italy; Website (institutional address; updated 5 Mar 2014)
MChin: Matteo Chinellato, Via Triestina, 126/A-30030 Tessera, Venezia, Italy; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 91, MAPS 42, 413-466 (2007)
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Photos:   
CreditPhotos
Photos from the Encyclopedia of Meteorites:
Matteo Chinellato   
Photos uploaded by members of the Encyclopedia of Meteorites.
    (Caution, these are of unknown reliability)
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 6781 approved meteorites from (Northwest Africa) (plus 2047 unapproved names)

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