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Northwest Africa 8604
Basic information Name: Northwest Africa 8604
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8604
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 604 g
Classification
  history:
Meteoritical Bulletin:  MB 103  (2014)  Eucrite-pmict
Recommended:  Eucrite-pmict    [explanation]

This is 1 of 344 approved meteorites classified as Eucrite-pmict.   [show all]
Search for other: Achondrites, Eucrites, and HED achondrites
Comments: Approved 30 Oct 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8604 (NWA 8604)

(Northwest Africa)

Purchased: 2013

Classification: HED achondrite (Eucrite, polymict)

History: Six stones weighing a total of 603.7 g were purchased by Blaine Reed during the 2013 Tucson Gem and Mineral Show.

Physical characteristics: Samples are angular to irregular-shaped fragments devoid of fusion crust. One stone shows a rounded exterior side with desert patina. Some stones contain a caliche patina.

Petrography: Description and classification (A. Love, App): Sample is a light gray, grain-supported fragmental breccia composed of clasts of cumulate and basaltic eucrites, related clastic materials and ~1 vol% diognitic orthopyroxene. 400 μm - 3.0 mm clasts are rounded to angular in shape and include: fine to medium-grained, ophitic, weakly shocked and shock melted cumulate eucrites. Cumulate clasts and related debris are composed of orthopyroxene, exsolved pigeonite and plagioclase displaying albite and Carlsbad twinning. Accessory minerals include olivine, a silica polymorph, ilmenite, troilite, minor chromite, and apatite.

Geochemistry: (A.Love, App) Orthopyroxene (Fs43.8-57.2Wo1.2-3.3), pigeonite host (Fs38.5-56.7Wo6.7-17.7), with clinopyroxene exsolution lamellae (Fs26.4-32.7Wo38.9-22.8); Ca-rich clinopyroxene (Fs26.2Wo38.6), Plagioclase (An88.9), diogenitic orthopyroxene (Fs33.4Wo3.2).

Classification: HED Achondrite (polymict eucrite)

Specimens: 28.3 g and 2 polished thin sections are on deposit at App

Data from:
  MB103
  Table 0
  Line 0:
Place of purchase:Tuscon Gem and Mineral Show
Date:P 2013
Mass (g):603.7
Pieces:6
Class:Eucrite-pmict
Shock stage:low
Weathering grade:low
Ferrosilite (mol%):43.8-57.2; 38.5-56.7; 26.4-32.7; 26.2
Wollastonite (mol%):1.2-3.3; 6.7-17.7; 38.9-22.8; 38.6
Classifier:A. Love, App
Type spec mass (g):28.3
Type spec location:App
Main mass:Blaine Reed
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)
Reed: Blaine Reed, P.O. Box 1141, Delta, CO 81416, United States; Website (private address)
Catalogs:
References: Published in Meteoritical Bulletin, no. 103, MAPS 52, 1014, May 2017, http://onlinelibrary.wiley.com/doi/10.1111/maps.12888/full
Find references in NASA ADS:
Find references in Google Scholar:
Geography: 
Coordinates:Unknown.

Statistics:
     This is 1 of 7101 approved meteorites from (Northwest Africa) (plus 2004 unapproved names)

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