0.831g Carbonaceous Chondrite CM2-an I NWA 3340
On offer: 0.831g Carbonaceous Chondrite meteorite specimen
Official name: NWA 3340
Classification: CM2 - an Carbonaceous ChondriteDescription: 0.831 gram CM2-an Carbonaceous Chondrite meteorite specimen with official name NWA 3340. According to the classifying researcher this is an anomalous CM2 because of, " the presence of chlorine-rich carbon compounds, which may be enigmatic chlorinated hydrocarbons, makes this specimen potentially unique among CM chondrites."
What you get: 0.831 gram specimen of NWA 3340 meteorite as shown, shipping/storage membrane box, and a signed certificate of authenticity.
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|Northwest Africa 3340|
Name: Northwest Africa 3340
This is an OFFICIAL meteorite name.
Abbreviation: NWA 3340
Observed fall: No
Year found: 2006
Country: (Northwest Africa)
Mass: 12.7 g
This is 1 of 10 approved meteorites classified as CM2-an. [show all]
Search for other: , Carbonaceous chondrites (type 2), CM chondrites, and CM-CO clan chondrites
|Comments:||Approved 24 Jul 2007
Revised 1 Dec 2014: Corrected O isotopes
Writeup from MB 92:
Northwest Africa 3340
Algeria or Morocco
Find: April 2006
Carbonaceous chondrite (CM2, anomalous)
History: Purchased by F. Kuntz in April 2006 in Erfoud, Morocco and subsequently acquired for the DuPont Collection at PSF.
Physical characteristics: Two pieces from a very fresh, broken, black, porous stone (total weight 12.7 g) with shiny fusion crust on one side.
Petrography: (A. Irving and S. Kuehner, UWS; T. Bunch, NAU) Sparse mineral grains, carbon-rich objects, dust-armored chondrules and rare refractory inclusion occur in a heterogeneous, very fine grained, porous matrix composed mainly of bladed phyllosilicates with some pentlandite and calcite (clearly visible under incident UV light). Olivine grains (up to 2 mm across) are commonly armored by fine, polycrystalline "dust" and contain inclusions of Ni-rich troilite, chromite, millerite, kamacite and taenite.Both pentlandite and magnesian olivine occur as separate smaller, angular grains. The carbon-rich objects (up to 50 mm across) consist of either pure graphite or a chlorine-rich organic phase. Chondrules consist of PO and POP, many having a fine-grained polycrystalline "dust" rims. One small refractory inclusion is composed of Mg-Al spinel with inclusions of perovskite.
Mineral compositions and geochemistry: Larger zoned olivine grains (e.g., Fa17.9-33.9, Fa39.9-66); smaller homogeneous olivine grains (e.g. Fa1.5, Fa19.9); pentlandite (Ni = 26.2 wt%). Matrix phyllosilicate material could not be analyzed quantitatively, but has very consistent proportions of Mg, Fe, Si and S. The chlorine-rich organic phase contains ~17 wt% Cl and ~32 wt% C, but no detectable N and minor O. Oxygen Isotopes: (D. Rumble, CIW) Replicate analyses by laser fluorination gave, respectively, [values redacted]*.
Classification: Carbonaceous chondrite (CM2, anomalous); minimal weathering. The presence of chlorine-rich carbon compounds, which may be enigmatic chlorinated hydrocarbons, makes this specimen potentially unique among CM chondrites.
Specimens: A total of 2.7 g of sample is on deposit at UWS and the remainder of the mass (10 g) is at PSF.
*) See erratum in MB103
Writeup from MB 103:
NWA 3340, erratum
The oxygen isotopic composition listed in MB92 was incorrect. The correct data are:
δ18O = 6.224, 7.049; δ17O = 0.494, 1.166; Δ17O = -2.780, -2.542 (all ‰).
Submitted by A. Irving and D. Rumble
NAU: Geology, Bldg 12 Knoles Dr Northern Arizona University, Flagstaff, AZ 86011, United States; Website (institutional address; updated 12 Apr 2012)
PSF: Planetary Studies Foundation,10 Winterwood Lane, Unit B, Galena, Illinois 61036-9283, United States; Website (institutional address; updated 1 Dec 2011)
UWS: University of Washington, Department of Earth and Space Sciences, 70 Johnson Hall, Seattle, WA 98195, United States (institutional address; updated 15 Jan 2012)
CIW: Carnegie Insitution Washington, Geophysical Laboratory, 5251 Broad Branch Rd., NW, Washington DC 20015, United States (institutional address)
DuPont: James M. DuPont Meteorite Collection, Deposited at FMNH in 2008., United States (private address; updated 1 Jun 2012)
Kuntz: Fabien Kuntz, France; Website (private address)
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