header
  MetSoc Home            Publications            Contacts  
Search the Meteoritical Bulletin Database
Last update: 19 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 1870
Basic information Name: Northwest Africa 1870
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 1870
Observed fall: No
Year found: 2019
Country: (Northwest Africa)
Mass:help 106 g
Classification
  history:
Recommended:  Eucrite    [explanation]

This is 1 of 560 approved meteorites (plus 1 unapproved name) classified as Eucrite.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 23 Jul 2022
Writeuphelp
Writeup from MB 111:

Northwest Africa 1870 (NWA 1870)

(Northwest Africa)

Purchased: 2019

Classification: HED achondrite (Eucrite)

History: The meteorite was exported from Morocco for purchase by N. Gessler.

Physical characteristics: A subangular single stone, 100% covered by matte crazed and splotchy black fusion crust. Cut face shows a medium light gray N6 matrix with inclusions <6 mm.

Petrography: The meteorite is intensely brecciated. The matrix appears nearly opaque in thin section, with typical grain size 0.02 mm. Scattered clasts are up to 3 mm, the largest being a brecciated basalt with granoblastic polygonalism evident in the pyroxene. Possibly paired with NWA 1861.

Geochemistry: Pyroxene (11 analyses) ranges from Fs48.1Wo4.2 to Fs55.2Wo6.1 to Fs28.7Wo38.5, and averages Fs49.8Wo9.7, with FeO/MnO (wt ratio) = 33.6. Plagioclase (8 analyses) ranges from An81.2 to An 92.2 and averages An88.9.

Classification: Eucrite, brecciated, probably polymict

Specimens: Main mass with Gessler, type specimen, including multiple thin sections, at UCLA.

Data from:
  MB111
  Table 0
  Line 0:
Date:P 2019
Mass (g):106
Pieces:1
Class:Eucrite
Shock stage:S2
Weathering grade:moderate
Ferrosilite (mol%):47.8
Wollastonite (mol%):9.7
Classifier:P. Warren, UCLA
Type spec mass (g):40
Type spec location:UCLA
Main mass:Nick Gessler
Finder:Anonymous
Comments:Submitted by Paul Warren
Institutions
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
Gessler: Nicholas Gessler, 2010 Calgary Lane, Los Angeles, CA 90077, United States (private address; updated 7 Jul 2016)
Catalogs:
References: Published in Meteoritical Bulletin, no. 111, in preparation (2022)
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 8580 approved meteorites from (Northwest Africa) (plus 1884 unapproved names)

Direct link to this page