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Northwest Africa 15767
Basic information Name: Northwest Africa 15767
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 15767
Observed fall: No
Year found: 2022
Country: (Northwest Africa)
Mass:help 2.7 kg
Classification
  history:
Meteoritical Bulletin:  MB 112  (2023)  L5-7
Recommended:  L5-7    [explanation]

This is 1 of 3 approved meteorites classified as L5-7.   [show all]
Search for other: L chondrites, L chondrites (type 4-7), Ordinary chondrites, and Ordinary chondrites (type 4-7)
Comments: Approved 19 Mar 2023
Writeuphelp
Writeup from MB 112:

Northwest Africa 15767 (NWA 15767)

(Northwest Africa)

Purchased: 2022 Dec

Classification: Ordinary chondrite (L5-7)

History: Purchased by S. Crivello and I. Pardini from a Moroccan dealer

Petrography: (K. Metzler, IfP) Ordinary chondrite breccia, consisting of chondritic lithic clasts of petrologic types 5 and 7, embedded in a fine-grained clastic matrix of related debris. Type 5 clasts wih clearly visible chondrules and secondary feldspar grains mostly <50 µm.

Geochemistry: Mineral compositions and geochemistry: Type 5 clasts: mean olivine composition Fa24.0±0.4 (Fa23.5-24.4; n=4); mean low-Ca pyroxene composition Fs19.9±0.1 Wo1.7±0.2 (Fs19.8-20.1Wo1.5-1.8; n=3). Type 7 clasts: mean olivine composition: Fa23.5±0.3 (Fa23.2-23.9; n=5); mean low-Ca pyroxene composition Fs19.7±0.3Wo2.4±0.3 (Fs9.4-20.1Wo1.9-2.7; n=7); mean CaO concentration in low-Ca pyroxene: 1.2±0.2 (1.0-1.4) wt%.

Classification: L chondrite based on mineral chemistry. Type 5 clasts based on the equilibrated state of olivine and pyroxene, and grain size of secondary plagioclase. Type 7 clasts with mean CaO concentration in low-Ca pyroxene above the limit value of 1.0 wt% (Tait et al., 2014).

Bibliography:
  • Tait A.W., Tomkins A.G., Gode B.M., Wilson S.A., Wilson, and Hasalova P. (2014) Investigation of the H7 ordinary chondrite, Watson 012: Implications for recognition and classification of Type 7 meteorites. Geochim. Cosmochim. Acta 134 175-196. (link)
Data from:
  MB112
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P 2022 Dec
Mass (g):2698
Pieces:1
Class:L5-7
Shock stage:C-S3
Weathering grade:W2/3
Fayalite (mol%):24.0±0.4; 23.5±0.3
Ferrosilite (mol%):19.9±0.1; 19.7±0.3
Wollastonite (mol%):1.7±0.2; 2.4±0.3
Classifier:K. Metzler, IfP
Type spec mass (g):20
Type spec location:IfP
Main mass:S. Crivello and I. Pardini
Comments:Submitted by K. Metzler, IfP
Institutions
   and collections
IfP: Institut für Planetologie, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany (institutional address; updated 23 Jan 2012)
Catalogs:
References: Published in Meteoritical Bulletin, no. 112, in preparation (2023)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Knut Metzler   
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9746 approved meteorites from (Northwest Africa) (plus 1855 unapproved names)

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