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2.3g CO3.0 - Carbonaceous Chondrite Meteorite

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  • $ 46.00


 

 

On Offer: 2.3g CO3.0 Carbonaceous Chondrite Meteorite fragment

Type: CO3.0 Carbonaceous Chondrite

Name: NWA 12930

Description: The CO carbonaceous chondrites are considered amongst the most pristine and unaltered of the carbonaceous chondrites, likely owing to their parent body having an orbit outside of a critical heating zone. This along with the absence of aqueous alteration left these unequilibrated chondrites much as they were when they formed over 4 billion years ago. Of all of the CO chondrites, those with a petrographic designation of 3.0 are the least altered and most pristine of the CO classifications.

What you get: CO3.0 Carbonaceous Chondrite specimen as shown, and signed Certificate of Authenticity.  

I offer a 100% no questions asked 30 day return policy.

 


SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW

Northwest Africa 12930
Basic information Name: Northwest Africa 12930
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12930
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 41 g
Classification
  history:
Meteoritical Bulletin:   MB 108   (2020)   CO3.0
Recommended:   CO3.0  

This is 1 of 22 approved meteorites classified as CO3.0.   [show all]
Search for other: Carbonaceous chondritesCarbonaceous chondrites (type 3)CM-CO clan chondrites, and CO chondrites
Comments: Approved 21 Nov 2019
Writeuphelp
Writeup from MB 108:

Northwest Africa 12930 (NWA 12930)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CO3.0)

History: Purchased Dec. 2018 by Dustin Dickens in Morocco from anonymous dealer.

Physical characteristics: Many small, identically appearing pieces. Most pieces are fragmented with partial fresh fusion crust. Broken surfaces are very dark colored with many small chondrules. Scattered, small CAIs are visible throughout.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous small chondrules, opaque matrix makes up approximately 40% of this meteorite. Mean apparent chondrule diameter 150±75 μm, n=27.

Geochemistry: (C. Agee, UNM) Olivine Fa8.0±14.4, Cr2O3=0.36±0.13 (wt%), n=22; low-Ca pyroxene Fs2.3±1.2Wo3.4±0.5, n=9.

Classification: Carbonaceous chondrite (CO3.0), 3.0 based on the Cr2O3 content and 1-sigma in olivine (Grossman and Brearley, 2005).

Specimens: 8.5 g including a probe mount on deposit at UNM, Dustin Dickens holds the main mass.

Bibliography:
  • Grossman J.N. and Brearley A.J. (2005) The onset of metamorphism in ordinary and carbonaceous chondrites. Meteorit. Planet. Sci. 40, 87-122. (link)
Data from:
  MB108
  Table 0
  Line 0:
Place of purchase: Morocco
Date: P 2018
Mass (g): 41
Pieces: Many
Class: CO3.0
Shock stage: low
Weathering grade: low
Fayalite (mol%): 8.0±14.4
Ferrosilite (mol%): 3.6±3.4
Wollastonite (mol%): 2.3±2.0
Classifier: C. Agee, UNM
Type spec mass (g): 8.5
Type spec location: UNM
Main mass: Dustin Dickens
Comments: Field name DD-55; submitted by C. Agee, UNM
Institutions
   and collections
UNM: Institute of Meteoritics MSC03 2050 University of New Mexico Albuquerque NM 87131-1126 USA, United States; Website (institutional address; updated 12 Feb 2015)

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