Menu
Cart 0
3.93g Ungrouped Chondrite Meteorite Slice I NWA 12273 Very Rare

3.93g Ungrouped Chondrite Meteorite Slice I NWA 12273 Very Rare

Top Meteorite

  • $2,763.00
On Offer: Ungrouped Chondrite 3.93g slice
Official name: NWA 12273
Dimensions: 26.33 mm x 19.64 mm x 1.46 mm
Description: A 3.93 gram slice of the ungrouped chondrite NWA 12273. Polished on one side, and wire cut finish on reverse. This meteorite defies any known classification, hence the "ungrouped, or "-ung" designation. It has visual characteristics similar to a Bencubbinite (CB-b) but with oxygen isotope values that plot with the LL chondrites. This is a very rare, unusual and scientifically significant meteorite. This meteorite is a bit of a cosmic irony, as it is extremely metal-rich but the LL chondrites are known for being relatively metal poor. This meteorite pairs with the Chondrite-ung NWA 12379.  
What you get: 3.93 gram Ungrouped Chondrite meteorite specimen as shown, membrane storage/display box, and signed Certificate of Authenticity. 
We offer a 100% no questions asked 30 day return policy.  

SEE OFFICIAL METEORITICAL SOCIETY ENTRY BELOW
Northwest Africa 12273
Basic information Name: Northwest Africa 12273
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12273 
Observed fall: No
Year found: 2018
Country: (Northwest Africa) 
Mass: 280 g
Classification
  history:
Recommended:   Chondrite-ung    [explanation]

This is 1 of 24 approved meteorites classified as Chondrite-ung.   [show all]
Search for other: Ungrouped chondrites
Comments: Approved 11 Dec 2018
Writeup
Writeup from MB 107: 

Northwest Africa 12273 (NWA 12273)

(Northwest Africa)

Purchased: 2018

Classification: Ungrouped chondrite

History: Purchased by Jay Piatek from a Moroccan meteorite dealer on October 25, 2018.

Physical characteristics: Dense, single individual. Fusion crust absent; abundant bright metal; scattered small chondrules are visible.

Petrography: (C. Agee, UNM) This meteorite consists of approximately 75% metal in the form of kamacite (~90%) and taenite (~10%) grains, diameters ranging from 50-500 μm. Minor troilite was observed throughout. Silicates occur primarily in the form of chondrules, most are porphyritic, diameters in the range 100-500 μm, making up approximately 20% of this meteorite.

Geochemistry: (C. Agee) Olivine Fa26.2±3.3, Fe/Mn=55±5, n=29; low-Ca pyroxene Fs15.3±1.8Wo0.7.±0.2, Fe/Mn=23±2, n=11. Oxygen isotopes (K. Ziegler, UNM): 3 acid-washed fragments analyzed by laser fluorination gave δ18O= 5.258, 5.613, 7.249; δ17O= 3.939, 3.971, 4.786; Δ17O= 1.163, 1.007, 0.959 (linearized, all per mil, TFL slope=0.528).

Classification: Ungrouped chondrite. This is a metal-rich chondrite with oxygen isotopes that overlap with LL-chondrites. The olivine Fa content is consistent with L3, however the low-Ca pyroxene Fs is consistent with H4. The high metal content is inconsistent with ordinary chondrite. Texturally, this meteorite resembles a CB-b, however the oxygen isotopes and Fa and Fs are unlike CB chondrites.

Specimens: 23.2 g including a probe mount on deposit at UNM, Jay Piatek holds the main mass of 240 g.

Data from:
  MB107
  Table 0
  Line 0:

 
Place of purchase: Morocco
Date: P 2018
Mass (g): 280
Pieces: 1
Class: Chondrite-ung
Shock stage: low
Weathering grade: low
Fayalite (mol%): 26.2±3.3
Ferrosilite (mol%): 15.3±1.8
Wollastonite (mol%): 0.7±0.2
Classifier: C. Agee, UNM
Type spec mass (g): 23.2
Type spec location: UNM

 







We Also Recommend
8.5g AGOUDAL I IIAB Iron Meteorite I Collector's Specimen

8.5g AGOUDAL I IIAB Iron Meteorite I Collector's Specimen

$36.00
12.65g AGOUDAL I IIAB Iron Meteorite

12.65g AGOUDAL I IIAB Iron Meteorite

$45.00
11.95 gram CANYON DIABLO meteorite - IAB Iron Meteorite

11.95 gram CANYON DIABLO meteorite - IAB Iron Meteorite

$51.00
12.44 gram CANYON DIABLO meteorite - IAB Iron Meteorite

12.44 gram CANYON DIABLO meteorite - IAB Iron Meteorite

$53.00
3.41g Eucrite Melt Breccia Corner Cut I HED I Taoudenni 005

3.41g Eucrite Melt Breccia Corner Cut I HED I Taoudenni 005

$57.00