On Offer: 1.66g C3-ung carbonaceous chondrite fragment
Official Name: NWA 12416
Description: This is a 1.66g specimen of NWA 12416 C3-ung carbonaceous chondrite.
Type: C3-ung Carbonaceous Chondrite Meteorite
Note: This meteorite along with a few other ungrouped carbonaceous "C" chondrites comprise a group of existing carbonaceous chondrites whos stable oxygen isotope ratios have recently been found to plot along the same unique line. As such, a subgroup of carbonaceous chondrites has been proposed, known as the "CT "subgroup. While this subgroup has been suggested, it has not yet been voted on or approved by Nomenclature Committee as of this writing 3/5/2022.
The petrologic designation of "3", indicates that the meteorite is unequilibrated and was not altered by water or chemical equilibration.
The "-ung" (ungrouped) designation is indicative of how unique this particular specimen of carbonaceous chondrites is, and to-date it still does not fit into any known carbonaceous classification structure, though it may soon.
What you get: 1.66 gram NWA 12416 C3-ung carbonaceous chondrite Meteorite Specimen as shown, Membrane Storage/Display Box, and signed Certificate of Authenticity.
I offer a 100% no questions asked 30 day .
Northwest Africa 12416 (NWA 12416)
(Northwest Africa)
Purchased: 2018 Jul
Classification: Carbonaceous chondrite (C3, ungrouped)
History: The first batch of this material was purchased by Adam Aaronson in July 2018 in Temara, Morocco; subsequently additional material was purchased from the same Moroccan source by Mark Lyon and others.
Physical characteristics: The material consists of numerous small black, friable stones, some completely fusion crusted (total weight 875 g).
Petrography: (A. Irving and S. Kuehner, UWS; L. Garvie, ASU) Granular chondrules (apparent diameter 350 210 m, N = 15) together with sparse mineral fragments and AOA (but no identifiable CAI or related mineral grains) are set in very fine grained matrix (~50 vol.%, black in thin section) containing minor kamacite and pentlandite. No phyllosilicates were detectable by X-ray diffraction.
Geochemistry: Olivine (Fa 1.0-67.1, N = 3), orthopyroxene (Fs 1.7-4.3Wo 0.9-3.1, N = 2), clinopyroxene (Fs 1.1Wo 23.2). Oxygen isotopes (K. Ziegler, UNM) Analyses of acid-washed subsamples by laser fluorination gave, respectively, 17O -10.290, -0.181, -11.117; 18O -6.827, 7.352, -7.023; 17O -6.685, -4.063, -7.409 per mil.
Classification: Carbonaceous chondrite (ungrouped Type 3). Oxygen isotope compositions plot at more negative 17O values than for CV, CK and most CM chondrites, and the absence of phyllosilicates excludes affinity to typical CM2 chondrites.
Specimens: 20.1 g including one polished thin section at UWB; 152 g at ASU; 361 g with Mr. M. Lyon; 137 g with Mr. M. Ouzillou; 205 g with Mr. A. Aaronson.
