6.43g R Chondrite Meteorite - R4 Breccia I Ultra Rare Chondrite NWA 11304

On Offer: 6.43g R Chondrite meteorite - R4 breccia | NWA 11304 Description: 6.43 gram R4 breccia end piece of the R type chondrite NWA 11304 meteorite. Polished on one side. Official Name: NWA 11304 Classification: Rumuruti Type (R) - R4 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 R4 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: 6.43 gram R chondrite NWA11304 specimen as shown, storage/display membrane box, signed certificate of authenticity. We offer a 100% no questions asked 30 day return policy SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW 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: (2018) R4 Recommended: R4 This is 1 of 61 approved meteorites classified as R4. [show all] 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 Fa1.0-1.2; predominantly Fa39.1-41.6; N = 4), orthopyroxene (core Fs4.5Wo0.4; mantle Fs16.3Wo2.7), clinopyroxene (Fs11.0-12.4Wo45.5-41.7, N = 2), plagioclase (Ab85.7An12.3Or14.6). 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