6.5g Rumuruti Chondrite Meteorite end slice - R 3/4 Breccia

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$185.00

On Offer: 6.5g R Chondrite- R3/4 breccia NWA 11304

Description: 6.5 gram R3/4 breccia unpolished end piece of the R type chondrite NWA 11304 meteorite.

Official Name: NWA 11304

Classification: Rumuruti Type (R) - R3/4 breccia

General Information: The R chondrite, as it is most commonly referred to, is one of the 5 known classes of chondritic meteorites: Ordinary, Carbonaceous, Enstatite (E), Rumuruti (R), and Kakangari (K). The R chondrite is the most oxidized of all the chondrites, and is the rarest of the chondrite classes with the exception for the K chondrite. This the R3/4 breccia displays three distinct lithologies: black, light grey, and brown. Depending on the specimen, it may have one, two or all three visible in a single stone.

What You Get: 6.5 gram R chondrite NWA11304 specimen as shown, storage/display membrane box, signed certificate of authenticity.

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Northwest Africa 11304

Basic information

Name: Northwest Africa 11304
This is an OFFICIAL meteorite name.
Abbreviation: NWA 11304
Observed fall: No
Year found: 2017
Country: (Northwest Africa)
Mass: 920 g

Classification
history:

Meteoritical Bulletin:	MB 107	(2018)	R4
Recommended:			R4

This is 1 of 73 approved meteorites classified as R4.
Search for other: Rumuruti chondrites, Rumuruti chondrites (type 4-7)

Comments:

Approved 7 Apr 2018

Writeup

Writeup from MB 107:

Northwest Africa 11304 (NWA 11304)

(Northwest Africa)

Purchased: 2017 April

Classification: Rumuruti chondrite (R4)

History: Purchased by Dustin Dickens in April 2017 from a Moroccan dealer.

Petrography: (A. Irving and S. Kuehner, UWS) The specimen is a breccia mostly composed of well-formed, relatively small chondrules (apparent diameter 250±150 µm, N = 12) in a finer grained matrix (~30 vol.%), but some petrologically-similar, angular lithic clasts (including type 3 and type 4 clasts) are also present. Both olivine and orthopyroxene have very magnesian cores, but the predominant mafic minerals are much more ferroan. Other minerals are clinopyroxene, sodic plagioclase, pentlandite, pyrrhotite and magnetite.

Geochemistry: Olivine (cores Fa_1.0-1.2; predominantly Fa_39.1-41.6; N = 4), orthopyroxene (core Fs_4.5Wo_0.4; mantle Fs_16.3Wo_2.7), clinopyroxene (Fs_11.0-12.4Wo_45.5-41.7, N = 2), plagioclase (Ab_85.7An_12.3Or_14.6).

Classification: R4. May contain R3 material.

Specimens: 21.2 g including one polished thin section at UWB; remainder with Mr. D. Dickens.

Data from:
  MB107
  Table 0
  Line 0:

Place of purchase:	Morocco
Date:	P 2017 April
Mass (g):	920
Pieces:	2
Class:	R4
Shock stage:	S2
Weathering grade:	low
Fayalite (mol%):	1.0; 39.1-41.6
Ferrosilite (mol%):	4.5; 16.3; 11.0-12.4
Wollastonite (mol%):	0.4; 2.7; 45.5-41.7
Classifier:	A. Irving and S. Kuehner, UWS
Type spec mass (g):	21.2
Type spec location:	UWB
Main mass:	D. Dickens
Comments:	Work name DD17-9; submitted by A. Irving