header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 30 Nov 2019
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 10728
Basic information Name: Northwest Africa 10728
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 10728
Observed fall: No
Year found: 2016
Country: (Northwest Africa)
Mass:help 137 g
Classification
  history:
Meteoritical Bulletin:  MB 105  (2016)  Martian (shergottite)
Recommended:  Martian (shergottite)    [explanation]

This is 1 of 200 approved meteorites (plus 1 unapproved name) classified as Martian (shergottite).   [show all]
Search for other: Martian meteorites
Comments: Approved 28 Jun 2016
Writeuphelp
Writeup from MB 105:

Northwest Africa 10728 (NWA 10728)

(Northwest Africa)

Purchased: 2016

Classification: Martian meteorite (Shergottite)

History: Purchased by Suzanne Morrison and Kevin Witts from a Moroccan meteorite dealer in Tucson in 2016.

Physical characteristics: Single stone; saw-cut surfaces show a green-gray-colored, diabasic texture, with elongate pyroxene crystals set in a finer matrix of maskelynite laths. Some sections show up to ~30%, by volume, black, shock melt pockets, many with mm-sized vesicles.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows ~60% pyroxene, ~30% maskelynite. Pyroxenes have igneous core-to-rim zonation in BSE images. Pyroxene grain size ranges up to several mm in length and 300-600 μm wide, maskelynite domains range from ~500-1500 μm. Shock melt veins and pockets with vesicles are ubiquitous. Accessory Ti-magnetite, iron-sulfide, ilmenite, and silica were observed.

Geochemistry: (C. Agee and M. Spilde, UNM). There are two distinct pyroxene compositional trends (pigeonite and augite) that are typical of mafic shergottites. Pigeonite Fs54.4±12.4Wo15.8±2.8, Fe/Mn=36±3, n=10; augite Fs23.5±3.9Wo32.8±2.4, Fe/Mn=29±2, n=11; maskelynite Or2.0±0.6Ab47.5±2.9An50.6±3.5, n=6.

Classification: Martian (diabasic shergottite), Shergotty-like pyroxene compositional trends. Likely paired with NWA 8656, NWA 8657, and NWA 10016.

Specimens: 20.1 g including a probe mount on deposit at UNM, Suzanne Morrison and Kevin Witts hold the main mass.

Data from:
  MB105
  Table 0
  Line 0:
Place of purchase:Tucson
Date:P 2016
Mass (g):137
Pieces:1
Class:Martian (shergottite)
Shock stage:high
Weathering grade:low
Ferrosilite (mol%):54.4±12.4, 23.5±3.9
Wollastonite (mol%):15.8±2.8, 32.8±2.4
Classifier:C. Agee, UNM
Type spec mass (g):20.1
Type spec location:UNM
Main mass:Suzanne Morrison and Kevin Witts
Comments:Submitted by C.Agee
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)
Catalogs:
References: Published in Meteoritical Bulletin, no. 105, MAPS 52, 2411, September 2017. http://onlinelibrary.wiley.com/doi/10.1111/maps.12944/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7035 approved meteorites from (Northwest Africa) (plus 2000 unapproved names)

Direct link to this page