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Northwest Africa 12859
Basic information Name: Northwest Africa 12859
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12859
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 498 g
Classification
  history:
Recommended:  H3    [explanation]

This is 1 of 597 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 Aug 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12859 (NWA 12859)

(Northwest Africa)

Purchased: 2018

Classification: Ordinary chondrite (H3)

History: Marc Jost purchased the sample from Abdelaziz Mouadine at the 2018 Munich Mineral show on October 24th, 2018.

Physical characteristics: The 498 g sample has a rounded, flattened shape with some broad shallow regmaglypts on one side. The exterior is completely covered by a weathered, brown fusion crust. The cut face shows the interior is compose of densely packed, well-formed chondrules.

Petrography: Description and classification (A. Love, App) Sample has a chondritic texture composed of distinct 634 μm (avg. dia.) chondrules and fragments set in a matrix of FeNi metal and FeS. Porphyritic chondrules contain turbid mesostasis and many chondrules display rims composed of FeS. Clinoenstatite is the dominant pyroxene. Sample has ~8 % FeNi metal. Additional minerals are chromite and merrillite.

Geochemistry: (A.Love-App) Olivine (Fa10.5±4.4 (Fa4.9-18.2), Fe/Mn=37.5±9.9, mean Cr2O3 in ferroan olivine=0.1±0.0, N=8), low Ca pyroxene Fs16.2±11.9Wo1.3±1.3 (Fs2.4-31.9Wo0.3-4.5), Fe/Mn=26.2±13.2, N=13.

Classification: Ordinary chondrite (H3, C-S3, W1 estimated subtype 3.6). H chondrite based on magnetic susceptibility metal abundance and mineral compositions. Sample is >3.5 based on lack of red CL in chondrules (Huss et al., 2006). Mesostasis glass was not observed, indicating sample is 3.6-3.7.

Specimens: Marc Jost (SJS) holds the main mass. 2 slices weighing 25.1 g, a polished mount and polished thin section and mount are on deposit at App.

Bibliography:
  • Huss, G.R., Rubin, A.E. and Grossman, J.N. (2006) Thermal Metamorphism in Chondrites. in Meteorites and the Early Solar System II, D.S. Lauretta and H.Y. McSween Jr. (eds.), University of Arizona Press, Tucson, 943 pp., 567-586. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase:Munich Mineral Show
Date:P 2018
Mass (g):498
Pieces:1
Class:H3
Shock stage:C-S3
Weathering grade:W1
Fayalite (mol%):10.5±4.1
Ferrosilite (mol%):16.2±11.9
Wollastonite (mol%):1.3±1.3
Magnetic suscept.:5.27
Classifier:A. Love, App
Type spec mass (g):25.1
Type spec location:App
Main mass:Marc Jost (SJS)
Finder:Unknown
Comments:Submitted by Anthony Love
Institutions
   and collections
App: Department of Geology, 572 Rivers St., Appalachian State University, Boone, NC 28608, United States (institutional address; updated 7 Mar 2013)
SJS: Space Jewels Switzerland, 2555 Brügg, Switzerland (private address; updated 3 Jan 2010)
Catalogs:
References: Published in Meteoritical Bulletin, no. 108, in preparation (2019)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7048 approved meteorites from (Northwest Africa) (plus 1998 unapproved names)

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