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Northwest Africa 16694
Basic information Name: Northwest Africa 16694
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 16694
Observed fall: No
Year found: 2021
Country: (Northwest Africa)
Mass:help 186 g
Classification
  history:
Recommended:  H3.05    [explanation]

This is 1 of 3 approved meteorites classified as H3.05.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 5 May 2024
Writeuphelp
Writeup from MB 113:

Northwest Africa 16694 (NWA 16694)

(Northwest Africa)

Purchased: June 2021

Classification: Ordinary chondrite (H3.05)

History: Purchased in June 2021 by Jasper Spencer from a meteorite dealer in Mauritania

Petrography: Chondrules are well-defined, set in opaque matrix. Average chondrule diameter 530±230 µm (range 230-1350 µm, N=39). Pervasive veins and extensive weathering (~70%) of metal.

Geochemistry: Mineral composition and geochemistry: All analyses by EPMA. Olivine measured across sample per Dodd et al (1967): Fa15.9±8.2, range Fa2.0-29.9. Fe/Mn=41.6±12.8 (N=26). Cr2O3 in ferroan olivine, specifially measured in cores = 0.49±0.16 (N=83). Pyroxene: Fs14.5±9.0En84.6±9.3Wo0.9±0.6, range Fs2.6-40.3 (N=40).

Classification: Ordinary chondrite (H3.05). Subtype based on Cr2O3 composition of ferroan olivine after Grossman and Brearley (2005).

Specimens: 30.39 g held at NHM.

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:
  MB113
  Table 0
  Line 0:
Place of purchase:Mauritania
Date:P June 2021
Mass (g):186
Pieces:1
Class:H3.05
Weathering grade:W3
Fayalite (mol%):15.9±8.2 (N=26)
Ferrosilite (mol%):14.5±9.0 (N=40)
Wollastonite (mol%):0.9±0.6
Classifier:N. V. Almeida (NHM)
Type spec mass (g):30.39
Type spec location:NHM
Main mass:Jasper Spencer
Finder:anonymous
Comments:Submitted by N. V. Almeida (NHM)
Institutions
   and collections		 NHM: Department of Mineralogy, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom; Website (institutional address; updated 9 Dec 2011)
Catalogs:
References: Published in Meteoritical Bulletin, no. 113, in preparation (2024)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 9914 approved meteorites from (Northwest Africa) (plus 1841 unapproved names)

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