09183 - NWA 12893 L6-S3-W2 Melt Breccia Chondrite 37.47 g Exclusive More than Half Part of The Main Mass

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09183 - NWA 12893 L6-S3-W2 Melt Breccia Chondrite 37.47 g Exclusive More than Half Part of The Main Mass

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Species

NWA 12893 L6-S3-W2 Melt Breccia Chondrite

Age

Location

Mauritania, Northwest Africa

Formation

L6-S3-W2 Melt Breccia Chondrite

Size

52.4 mm • in

Weight

37.47 g • oz

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Description

Beautiful example of 37.47g of this type of Melt Breccia Chondrite L6, named as NWA 12893

SPECIMEN PROVIDED BY THE ORIGINAL CLASSIFIER D. Sheikh, FSU

Only 56.1g Main mass. Exclusive specimen : More than Half Part of The Main Mass.

The authenticity of this specimen is guaranteed by the geologist Juan Avilés Poblador, member of International Meteorite Collectors Association (IMCA 5681).

Northwest Africa 12893

Basic information

Name: Northwest Africa 12893
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12893
Observed fall: No
Year found: 2018
Country: Mauritania
Mass: 56.1 g

Classification
history:

Recommended:

L6-melt breccia [explanation]

This is 1 of 40 approved meteorites classified as L6-melt breccia. [show all]
Search for other: L chondrites, L chondrites (type 4-7), Melted chondrites, Ordinary chondrites, and Ordinary chondrites (type 4-7)

Comments:

Approved 11 Oct 2019

Writeup

Writeup from MB 108:

Northwest Africa 12893 (NWA 12893)

Mauritania

Purchased: 2018

Classification: Ordinary chondrite (L6, melt breccia)

History: Purchased online in 2018 by Daniel Sheikh from Matthew Stream, who had purchased it in 2017 from a seller in Mauritania.

Physical characteristics: Single stone with dark-brown fusion crust. Interior slice reveals brecciated texture.

Petrography: (Daniel Sheikh, FSU) Sample is a breccia composed of angular clasts (up to 2.5 cm) set in a shock melted matrix. Major phases present include olivine, low-ca pyroxene, high-ca pyroxene, sodic plagioclase (Av. 60 μm), kamacite, taenite, and troilite. Accessory chromite is present as well. A few of the clasts contain relict chondrule (BO and RP) fragments.

Geochemistry: (Daniel Sheikh, FSU) Olivine (Fa_24.8±0.6, n=87), low-Ca Pyroxene (Fs_21.1±0.6Wo_1.4±0.2, n=48), high-Ca Pyroxene (Fs_8.5±0.7Wo_43.7±0.7, n=11), Sodic Plagioclase (An_11.3±0.6, n=43), Chromite (Cr/(Cr+Al)=85.5±0.2, n=4).

Classification: Ordinary chondrite (L6-melt breccia)

Specimens: 16.83 grams at UCLA; main mass with Daniel Sheikh.

Data from:
  MB108
  Table 0
  Line 0:

Place of purchase:	Mauritania
Date:	P 2018
Mass (g):	56.05
Pieces:	1
Class:	L6-melt breccia
Shock stage:	S3
Weathering grade:	W2
Fayalite (mol%):	24.8±0.6
Ferrosilite (mol%):	21.1±0.6, 8.5±0.7
Wollastonite (mol%):	1.4±0.2, 43.7±0.7
Classifier:	D. Sheikh, FSU
Type spec mass (g):	16.83
Type spec location:	UCLA
Main mass:	Daniel Sheikh
Comments:	Submitted by Daniel Sheikh

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)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)

CERTIFICATE OF AUTHENTICITY

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