Meteoritical Bulletin: Entry for Northwest Africa 12296

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Northwest Africa 12296

Basic information

Name: Northwest Africa 12296
This is an OFFICIAL meteorite name.
Abbreviation: NWA 12296
Observed fall: No
Year found: 2017
Country: Morocco
Mass: 15 g

Classification
history:

Meteoritical Bulletin:	MB 108	(2020)	R3-4
Recommended:			R3-4 [explanation]

This is 1 of 12 approved meteorites classified as R3-4. [show all]
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 3)

Comments:

Approved 2 Feb 2019

Writeup

Writeup from MB 108:

Northwest Africa 12296 (NWA 12296)

Morocco

Find: 2017

Classification: Rumuruti chondrite (R3-4)

Physical characteristics: The exterior fusion crust is dark brown and weathered. The interior is primarily reddish-brown with light gray to black clasts (0.1-1 mm).

Petrography: (D. Sheikh, FSU) Breccia consisting of unequilibrated (R3) and equilibrated (R4) clasts. Well-formed chondrules (0.2-0.8 mm). Iron-nickel sulfides present; no metal observed. Shock melt veins present.

Geochemistry: Olivine in type 3 clasts: Fa_32.6±11.7(Fa_8.8-49.6, N=46); olivine in type 4 clasts: Fa_38.2±0.8(N=23); low-ca pyroxene in type 3 clasts: Fs_20.5±7.4Wo_2.4±1.0(Fs_11.2-35.8Wo_0.7-5.5, N=40); Ca-pyroxene in type 3 clasts: Fs_20.1±2.8Wo_25.7±6.0(Fs_14.6-21.9Wo_17.6-31.4, N=6).

Classification: Rumuruti Chondrite (R3-4)

Specimens: 4.92 grams at UCLA; main mass with Matthew Stream.

Data from:
  MB108
  Table 0
  Line 0:

Date:	2017
Mass (g):	15
Pieces:	1
Class:	R3-4
Shock stage:	S2
Weathering grade:	W2
Classifier:	D. Sheikh, FSU
Type spec mass (g):	4.92
Type spec location:	UCLA
Main mass:	Matthew Stream
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)

Catalogs:

References:

Published in Meteoritical Bulletin, no. 108 (2020) Meteorit. Planet. Sci. 55, 1146-1150