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699.4g CO 3.2 Museum Piece Carbonaceous Chondrite Meteorite

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  • $ 31,500.00


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On Offer: 699.4g CO 3.2 Carbonaceous Chondrite Meteorite

Type: CO3.2

Name: NWA 8345

MASS: 699.4 grams

Description: A rare CO3.2 collector's / museum specimen carbonaceous chondrite with excellent form and presentation. An exceptional meteorite rarely offered. Only 13 known CO.3.2 meteorites and 9 if excluding antarctic finds. 

I offer a 100% no questions asked 15 day return policy.

ID - NWA834520170001

Northwest Africa 8345
Basic information Name: Northwest Africa 8345
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 8345
Observed fall: No
Year found: 2013
Country: (Northwest Africa)
Mass:help 986 g
Classification
  history:
Recommended:   CO3.2    [explanation]

This is 1 of 13 approved meteorites classified as CO3.2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 3), CM-CO clan chondrites, and CO chondrites
Comments: Approved 27 Apr 2014
Writeuphelp
Writeup from MB 103:

Northwest Africa 8345 (NWA 8345)

(Northwest Africa)

Purchased: 2013

Classification: Carbonaceous chondrite (CO3.2)

History: Purchased by Sean Tutorow from a Moroccan dealer in Quartzsite, Arizona, January 2013.

Physical characteristics: Three pieces that fit together, partial black fusion crust, saw cut reveals many sub-mm chondrules and sparse small CAIs set in a dark gray-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous, small (50-400 μm) unequilibrated chondrules, many are porphyritic, fine grained matrix makes up approximately 30% of this meteorite. Melilite, anorthite, Ti-rich aluminous diopside, aluminous diopside, aluminous enstatite, aluminous low-Ca pyroxene, augite, troilite and Fe-Ni metal detected.

Geochemistry: (C. Agee and N. Muttik, UNM) Type I chondrules: olivine Fa1.3±0.4, n=7; enstatite Fs1.9.±1.7Wo0.8±1.6, n=6. Type II chondrules: olivine Fa31.5±17.6, Fe/Mn=91±26, Cr2O3=0.14±0.09 wt%, n=23; low-Ca pyroxene Fs5.5±4.3Wo1.6±1.3, n=6.

Classification: Carbonaceous chondrite (CO3.2). Type 3.2 based on mean value and sigma of Cr2O3 in ferroan chondrule olivines, as given by Grossman and Brearley (2005).

Specimens: 21 g including a probe mount on deposit at UNM, Dustin Dickens now holds the main mass.


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