09184 - Top Rare NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type  3.63g
09184 - Top Rare NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type  3.63g 09184 - Top Rare NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type  3.63g 09184 - Top Rare NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type  3.63g 09184 - Top Rare NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type  3.63g

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09184 - Top Rare NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type 3.63g

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NWA 12778 Carbonaceous Chondrite Meteorite CM2 Type
Northwest Africa
Carbonaceous Chondrite CM2
20.3 mm   •    in
3.63 g   •    oz
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Beautiful example of 3.63g of this rare type of Carbonaceous Chondrite CM2.


Only 35.8g Main mass. Approved 26 Sep 2019

The authenticity of this specimen is guaranteed by the geologist Juan Avilés Poblador, member of International Meteorite Collectors Association (IMCA 5681). 

Northwest Africa 12778
Basic information Name: Northwest Africa 12778
     This is an OFFICIAL meteorite name.
Abbreviation: NWA 12778
Observed fall: No
Year found: 2018
Country: (Northwest Africa)
Mass:help 35.8 g
Recommended:   CM2    [explanation]

This is 1 of 533 approved meteorites classified as CM2.   [show all]
Search for other: Carbonaceous chondrites, Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
Comments: Approved 26 Sep 2019
Writeup from MB 108:

Northwest Africa 12778 (NWA 12778)

(Northwest Africa)

Purchased: 2018

Classification: Carbonaceous chondrite (CM2)

History: Purchased by Matthew Stream from Mike Bandli in 2018, who purchased it from Aziz Habibi at the 2018 Tucson Gem and Mineral Show.

Physical characteristics: Four dark-gray stones. A slice reveals a dark fine-grained interior.

Petrography: (D. Sheikh, FSU) Small chondrules present (mean diameter ~260 µm), isolated mineral fragments (Olivine, low-Ca pyroxene, high Ca-Pyroxene) and small CAIs with fine-grained dust rims set in a dark, abundant matrix. In many chondrules the mesostasis has been aqueously altered to phyllosilicates. The matrix also contains phyllosyllicates as indicated by low microprobe totals.

Geochemistry: (D. Sheikh, FSU) Olivine (Fa11.9±17.0, range Fa0.7-41.4, Cr2O3=0.40±0.13, n=12); low-Ca Pyroxene (Fs3.5±3.3 Wo0.8±0.3, range Fs1.1-5.9Wo0.6-1.0, n=10). Isolated mineral grains of low-Ca Pyroxene (Fs27.8±1.1 Wo0.5±0.1, range Fs26.9-29.0Wo0.4-0.6, n=3) and high-Ca Pyroxene (Fs9.9 Wo9.2, n=1) found in matrix.

Classification: Carbonaceous Chondrite (CM2)

Specimens: 7.22 grams at UCLA; main mass with Matthew Stream.

Data from:
  Table 0
  Line 0:
Place of purchase: Tucson
Date: P 2018
Mass (g): 35.8
Pieces: 4
Class: CM2
Shock stage: low
Weathering grade: low
Fayalite (mol%): 11.9±17.0 (0.7-41.4, n=12)
Ferrosilite (mol%): 3.5±3.3 (1.1-5.9, n=10)
Wollastonite (mol%): 0.8±0.3 (0.6-1.0, n=10)
Classifier: D. Sheikh, FSU
Type spec mass (g): 7.22
Type spec location: UCLA
Main mass: Matthew Stream
Comments: Submitted by Daniel Sheikh
   and collections
UCLA: Institute of Geophysics and Planetary Physics, University of California, Los Angeles, CA 90095-1567, United States (institutional address; updated 17 Oct 2011)
FSU: Department of Geological Sciences, Florida State University, Tallahassee FL 32306-4100, United States (institutional address; updated 16 Dec 2010)

Carbonaceous chondrites or C chondrites are a class of chondritic meteorites comprising at least 8 known groups and many ungrouped meteorites. They include some of the most primitive known meteorites. The C chondrites represent only a small proportion (4.6%) of meteorite falls.


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