header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 6 Aug 2022
Search for: Search type: Search limits: Display: Publication:
Names
Text help
Places
Classes
Years
Contains
Starts with
Exact
Sounds like
NonAntarctic
Falls  Non-NWAs
What's new
  in the last:
Limit to approved meteorite names
Search text:  
Northwest Africa 14907
Basic information Name: Northwest Africa 14907
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 14907
Observed fall: No
Year found: 2018
Country: Mali
Mass:help 550 g
Classification
  history:
Recommended:  H3    [explanation]

This is 1 of 663 approved meteorites (plus 2 unapproved names) classified as H3.   [show all]
Search for other: H chondrites, H chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)
Comments: Approved 9 May 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 14907 (NWA 14907)

Mali

Purchased: 2018

Classification: Ordinary chondrite (H3)

History: The meteorite was found by nomads in Mali. Zs. Kereszty purchased the stone from a Moroccan dealer in 2018.

Physical characteristics: (D. Rezes and Zs. Kereszty, CSFK) A partially black fusion crusted, single, flat stone (550 g). The interior of the stone has bluish light gray colour. Cut surface reveals sharply defined chondrules. Many chondrules are flattened. Abundant amount of metal and troilite are observable. Most of these grains are intact, not weathered.

Petrography: (D. Rezes, CSFK) Chondritic texture with densely packed, sharply defined chondrules with an average diameter of 684 µm, N=38. The largest chondrule in the examined thin section is 3980 by 3010 µm. Minor mineral phases are troilite and chlorapatite. The opaque matrix contains abundant amount of sodic plagioclase grains (~10 µm). Olivine grains show mosaicism and planar fractures. FeNi metal and troilite grains are intact, only minor weathering can be seen.

Geochemistry: (D. Rezes, CSFK) Chondrule olivine Fa15.48±6.36 (range Fa4.38-24.06; PMD Fa=41.10%), Cr2O3(wt%)=0.06±0.04 (range 0.00-0.15), Fe/Mn=54.4±13.2, N=18; low-Ca pyroxene Fs6.65±2.44Wo0.57±0.20 (range Fs3.43-10.19Wo0.28-0.79, PMD Fs=36.67%), Fe/Mn=27.4±17.1, N=5; sodic plagioclase Ab85.84±0.81An9.63±1.23Or4.53±1.96, N=4.

Classification: Unequilibrated ordinary chondrite (H3), estimated subtype is approx. 3.5. H based on Fa of olivine and significant metal content. Subtype is based on PMD Fa and Fs values and mean Cr2O3-content and sigma of ferroan olivine from Grossman and Brearley (2005). The Cr2O3 values and standard deviation of ferroan chondrule olivines are in the field of UOCs with petrologic type >3.2. Shock stage S4, weathering grade W1.

Specimens: 25 g on deposit at CSFK, ZKereszty holds the main mass.

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:
  MB111
  Table 0
  Line 0:
Place of purchase:Morocco
Date:P 2018
Mass (g):550
Pieces:1
Class:H3
Shock stage:S4
Weathering grade:W1
Fayalite (mol%):15.48±6.36 (N=18)
Ferrosilite (mol%):6.65±2.44 (N=5)
Wollastonite (mol%):0.57±0.20
Classifier:D. Rezes, CSFK
Type spec mass (g):25
Type spec location:CSFK
Main mass:ZKereszty
Comments:Work name: ZK-21; submitted by Daniel Rezes
Institutions
   and collections
ZKereszty: Gyor, Lahner 1. 9024 , Hungary (private address; updated 8 Sep 2014)
CSFK: Research Center for Astronomy and Earth Sciences, H-1121 Budapest, Konkoly Thege Miklós út 15-17.l Hungary, Hungary (institutional address; updated 7 Apr 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Photos:
CreditPhotos
Public domain photographs:
Daniel Rezes               
Geography:

Mali
Coordinates:Unknown.

Statistics:
     This is 1 of 69 approved meteorites from Mali (plus 1 unapproved name)

Direct link to this page