On Offer: Ultra rare 5 gram end cut of LL3.00 unequilibrated primitive chondrite

Official name: NWA 8576

Type: LL3.00

Year found: 2014

Country: Morocco

Description: 5 gram end cut of LL3.00 unequilibrated chondrite NWA 8576. Many type 3 chondrites are described as being unequilibrated, but only the 3.00 specimens can truly claim this.

NWA 8576 is a lovely chondrite displaying very tightly packed & well formed chondrules. As Type 3 primitive chondrite, this meteorite has undergone little to no chemical equilibration since its formation.

What you get: NWA 8576 LL3.00 Chondrite Meteorite Specimen as Shown, Membrane Storage/Display Box, & signed Certificate of Authenticity.

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

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Northwest Africa 8576

Basic information

Name: Northwest Africa 8576
This is an OFFICIAL meteorite name.
Abbreviation: NWA 8576
Observed fall: No
Year found: 2014
Country: Morocco
Mass:59.5 g

Classification
history:

Meteoritical Bulletin:	MB 103	(2014)	LL3.00
Recommended:			LL3.00 [explanation]

This is 1 of 4 approved meteorites classified as LL3.00. [show all]
Search for other: LL chondrites, LL chondrites (type 3), Ordinary chondrites, and Ordinary chondrites (type 3)

Comments:

Approved 25 Oct 2014

Writeup

Writeup from MB 103:

Northwest Africa 8576 (NWA 8576)

Morocco

Purchased: May 2014

Classification: Ordinary chondrite (LL3.00)

History: Purchased by Brahim Tahiri from a Moroccan hunter in Erfoud, Morocco and sent to his partner Sean Tutorow for classification.

Geochemistry: Ferroan olivine contains 0.46±0.09 wt.% Cr₂O₃, n=25; Kamacite: 0.42±0.26 wt.% Co; 5.5±1.8 wt.% Ni (n=9). There is a positive correlation between the Co and Ni values in the kamacite, as is found in other highly unequilibrated chondrites. The Cr content of the kamacite is 0.22±0.31 wt.% with a range of 0.00-0.84 wt.%. P (0.03±0.03 wt.%) and Si (0.03±0.04 wt.%) are both approximately at the detection limit.

Classification: Optical microscopy shows that this meteorite has ferroan olivine grains with no chromite exsolution; this implies it is outside the 3.05-3.15 range. About 10 different porphyritic chondrules in the thin section were examined. The meteorite cannot be type 3.2 or higher since it has such high Cr in the ferroan olivine and a low standard deviation similar to Semarkona (LL3.00), Grossman and Brearley (2005). The chondrules average about 600 μm in diameter, consistent with an LL classification.

Bibliography:

Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)

Data from:
  MB103
  Table 0
  Line 0:

Place of purchase:	Erfoud, Morocco
Date:	P May 2014
Mass (g):	59.45
Pieces:	1
Class:	LL3.00
Shock stage:	S1
Weathering grade:	W4
Fayalite (mol%):	14.3±5.9 (n=25)
Ferrosilite (mol%):	10.0±8.4 (n=20)
Wollastonite (mol%):	1.0±1.1
Classifier:	A. Rubin, UCLA
Type spec mass (g):	11.90
Type spec location:	UCLA
Main mass:	Sean Tutorow
Comments:	Field number - G580.; submitted by Sean Tutorow

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)