On Offer: 20.86 gram EL6 - Enstatite Chondrite end piece I NWA 7401

Type: Enstatite chondrite - EL6

Origin: Morocco

Official name: NWA 7401

Description: One of the early Northwest African classifications, this is an exceptional 20.86 gram EL6 meteorite end piece. The EL and EH chondrites are a unique group of chondritic meteorites with compositions dominated by orthopyroxene (enstatite) rather than olivine and more Ca rich pyroxenes. Enstatite is a pyroxene with a very low amount of calcium compared to other types of pyroxene, and often displays large well delineated grains.

What you get: 20.86g NWA 7401 EL6 Meteorite specimen as shown, membrane storage/display box, & signed Certificate of Authenticity.

I offer a 100% no questions asked 30 day return policy.

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Northwest Africa 7401

Basic information

Name: Northwest Africa 7401
This is an OFFICIAL meteorite name.
Abbreviation: NWA 7401
Observed fall: No
Year found: 2012
Country: Morocco
Mass: 996 g

Classification
history:

Meteoritical Bulletin:	MB 101	(2013)	EL6
Recommended:			EL6

This is 1 of 104 approved meteorites classified as EL6. [show all]
Search for other: EL chondrites, Enstatite chondrites, Enstatite chondrites (type 4-7), and Enstatite-rich meteorites

Comments:

Approved 12 Oct 2012

Writeup

Writeup from MB 101:

Northwest Africa 7401 (NWA 7401)

Morocco

Purchased: May 2012

Classification: Enstatite chondrite (EL6)

History: Purchased by Sean Tutorow in Morocco, May 2012.

Physical characteristics: 150 matched stones found together, weathered exterior, saw cut reveals light-gray, very fine grained texture, a few scattered light-colored chondrules, numerous small voids, friable.

Petrography: (C. Agee, UNM) SEM examination of a saw cut surface shows a distinct 3 mm radial pyroxene chondrule set in a matrix dominated by orthopyroxene, with accessory plagioclase. Plagioclase to 300 μm. No other chondrules with discernable outlines observed in the section. Matrix pyroxenes to ~100 microns; chondrule pyroxenes mostly elongate prisms to ~1 mm. Ubiquitous daubreelite, Si-bearing kamacite, and taenite. Minor schreibersite and K-rich sulfide (possibly djerfisherite). Some oxide and sulfate weathering products present on grain boundaries.

Geochemistry: (C. Agee and M. Spilde, UNM) Enstatite Fs_0.6Wo_3.4; plagioclase Or_6.8Ab_71.1An_22.0; kamacite Si=1.16, Ni=5.05 (wt%).

Classification: Enstatite chondrite (EL6), EL based on Si content of kamacite, type 6 based on absence of significant glass or olivine in the single analyzed chondrule and large plagioclase grains. This meteorite shares some textural similarities with Al Haggounia 001, although its plagioclase composition is significantly higher in An.

Specimens: 39.53 g including a probe mount on deposit at UNM, Sean Tutorow holds the main mass.

Data from:
  MB101
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P May 2012
Mass (g):	995.59
Pieces:	150
Class:	EL6
Ferrosilite (mol%):	0.6
Wollastonite (mol%):	3.4
Classifier:	C. Agee, UNM
Type spec mass (g):	39.53
Type spec location:	UNM
Main mass:	Sean Tutorow
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)