On Offer: Ultra rare 5 gram end piece 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 and 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, and signed Certificate of Authenticity.

I offer a 100% no questions asked 30 day .

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Northwest Africa 8576Basic informationName: 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) LL3.00Recommended: 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 2014Writeup
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.% Cr 2O 3, 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), Reference:
Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci.40, 87-122.
,WIDTH,400)" data-sanitized->Grossman and Brearley (2005). The chondrules average about 600 m 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, MoroccoDate:P May 2014Mass (g):59.45Pieces:1Class:LL3.00Shock stage:S1Weathering grade:W4Fayalite (mol%):14.3 5.9 (n=25)Ferrosilite (mol%):10.0 8.4 (n=20)Wollastonite (mol%):1.0 1.1Classifier:A. Rubin, UCLAType spec mass (g):11.90Type spec location:UCLAMain mass:Sean TutorowComments:Field number - G580.; submitted by Sean TutorowInstitutions
and collectionsUCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
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Product Attributes:

Featured Refinements: Meteorite Slice

Weight (lbs.): 0.50 lb

Length (in.): 9

Width (in.): 1

Height (in.): 3