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Northwest Africa 4895
Basic information Name: Northwest Africa 4895
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 4895
Observed fall: No
Year found: 2007
Country: (Northwest Africa)
Mass:help 305 g
Classification
  history:
Recommended:  CR2    [explanation]

This is 1 of 182 approved meteorites classified as CR2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), and CR chondrites
Comments: Approved 11 Dec 2021
Writeuphelp
Writeup from MB 110:

Northwest Africa 4895 (NWA 4895)

(Northwest Africa)

Purchased: 2007

Classification: Carbonaceous chondrite (CR2)

History: The meteorite was purchased from a local meteorite dealer in Erfoud, Morocco.

Physical characteristics: Dark brownish rock without fusion crust.

Petrography: Carbonaceous chondrite composed of abundant large, dominantly porphyritic type I chondrules (apparent mean diameter about 700 µm) set into a fine-grained iron-rich matrix. Few type II chondrules, Fe-rich olivine mineral fragments, and CAIs are present. Type I chondrules often show characteristic metal rims and contain abundant metal blebs. Opaque phases in Type II chondrules are mostly sulfides. Low analytical totals of matrix analyses suggest the presence of hydrous phyllosilicates.

Geochemistry: olivine in type I chondrules: Fa2.2±0.2 (Fa1.7-2.4, Cr2O3: 0.66±0.14 wt%, n=17; low-Ca pyroxene: Fs2.1±0.9Wo1.3±1.1 (Fs1.4-4.4Wo0.4-4.2, n=18); olivine in type II chondrules: Fa33.2±9.7 (Fa23.4-54.5, n=15); low-Ca pyroxene: Fs26.4±2.5Wo2.5±0.7 (Fs23.6-30.6Wo1.9-4.5, n=10). Matrix analyses yield an average total of 82.8±2.7 wt% (5 µm defocused beam, N=7) suggesting the presence of hydrous minerals.

Data from:
  MB110
  Table 0
  Line 0:
Place of purchase:Erfoud, Morocco
Date:P 2007
Mass (g):305
Pieces:1
Class:CR2
Shock stage:S2
Weathering grade:moderate
Fayalite (mol%):2.2; 33.2
Ferrosilite (mol%):2.1; 26.4
Magnetic suscept.:5.19
Classifier:A. Greshake, MNB
Type spec mass (g):20.9
Type spec location:MNB
Main mass:Stefan Ralew
Comments:Submitted by Ansgar Greshake
Institutions
   and collections
MNB: Museum für Naturkunde, Invalidenstraße 43, D-10115 Berlin, Germany (institutional address; updated 24 Dec 2011)
Ralew: Stefan Ralew, Kunibertstraße 29, 12524 Berlin, Germany; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 110, in preparation (2021)
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Photos:
CreditPhotos
Public domain photographs:
Ansgar Greshake         
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8495 approved meteorites from (Northwest Africa) (plus 1899 unapproved names)

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