NWA7892-CO3.0

Meteorites For Sale.

100% Authentic Meteorite Specimens For Collection & Study

email me at mendy.ouzillou AT gmail.com

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NWA 7892:  One of only 3 Non-Antarctic CO3.0 (TKW = 246g)

Physical characteristics: Single stone, distinctive polygonal, dark brown weathered fusion crust, saw-cut reveals many small chondrules in a very fine-grained dark-brown matrix.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows many PP, POP, and PO chondrules, most 50-300 μm, irregular shaped or fragmental chondrules common.

Geochemistry: (C. Agee and L. Burkemper, UNM) Random chondrule olivine range Fa0.3-56.8, mean=Fa17.5, n=22, chondrule ferroan olivine mean Fa30.7±13.4, Cr2O3=0.39±0.19 wt%, Fe/Mn=95±25, n=35; low-Ca pyroxene range Fs 0.8-41.3, mean Fs8.0, n=17; aluminous diopside Al2O3=8.76 wt%. (Karen Ziegler, UNM) Oxygen isotope mean values of analyses on 2 acid-washed aliquots of bulk sample, 1.2, 1.1 mg, gave δ17O= -8.851, -9.836, δ18O= -5.849, -6.906, Δ17O= -5.763, -6.190, (linearized, all permil).

Classification: Carbonaceous chondrite (CO3.0) estimated 3.05, based on mean Cr2O3=0.39 wt% in 35 chondrule ferroan olivines which is higher than that measured in the most primitive CO3 chondrite currently known (ALH 77307), but with higher standard deviation (σ-Cr2O3), analogous to the higher σ-Cr2O3 reported in type 3.05 ordinary chondrites QUE 97008MET 00526, and EET 90161 (Grossman and Brearley, 2005). Oxygen isotopes values significant lower than literature CO bulk values, and slightly above the CCAM.

Notes from Dr. Carl Agee: The weathering is difficult to determine because of the fine grained matrix. Estimated at W1-W2. The fusion crust is weathered smooth and has brown alligator crust. The matrix is dark brown and with tiny chondrules.

Additional Photos: Crust (great alligator skin!) and closeup of surface

NWA7892-CO3p0     NWA7892-crust     NWA7892-10XMAG

 

SEM Images:

NWA7892-SEM1     NWA7892-SEM2     NWA7892-SEM3

Slices for Sale at $100/g: (all slices expertly cut &  prepared my Marlin Cilz)

I will be cutting more material in late Q3 or early Q4 of 2015. Please let me know if you would like to reserve a slice ahead of time.

All slices have crust. Click on images below to view the full size image.

Full Slice #1:  7.8g, 44 x 40.0 x 2.2mm — SOLD

NWA7892-1f     NWA7892-1b

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Full Slice #2: 9.2g, 47.9 x 43.1 x 2.2mm - - SOLD

NWA7892-2f     NWA7892-2b

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Full Slice #3: 7.9g, 40.6x 43.6 x 2.3mm - - SOLD

NWA7892-3f     NWA7892-3b

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