NWA 8276 – L3.00 W1 Remarkable and scientifically important meteorite

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New L3.00 “not so” Ordinary Chondrite

NWA 8276 represents one of the least altered meteorites ever found and represents matter from the earliest times in our solar system history (TKW = 789g)

History: Adam Bates identified this meteorite from images he received as a possible pairing to NWA 7731, even though they came from a different Moroccan meteorite dealer. Both pieces were then purchased within a few weeks of each other in October 2013. The meteorite dealer claimed both pieces originated in Mauritania.

Physical characteristics: A single stone, broken into two pieces (394 and 395 g) that fit together, >90% black fusion crust with polygonal cracks, light desert weathering, saw-cut reveals many densely packed chondrules of variable size.

Petrography: (C. Agee, UNM) Microprobe examination of a polished mount shows numerous unequilibrated chondrules, apparent mean diameter 496±296 μm (n=122), many with porphyritic, igneous-zoned olivines and pyroxenes, most with glass or mesostasis. Abundant fine-grained matrix throughout.

Geochemistry: (C. Agee, N. Muttik, H. Miley, UNM) All chondrule olivine Fa12.2±9.3, range Fa0.7-26.3, n=67; ferroan olivine Fa17.8±5.9, Fe/Mn=47±11, Cr2O3=0.42±0.10 wt%, range Cr2O3=0.29-0.66 wt%, n=44; low-Ca pyroxene Fs13.0±8.3Wo1.9±2.7, Fe/Mn=26±14, n=41. Augite and aluminous diopside present. Mesostasis or glass (n=25) in 10 ferroan porphyritic chondrules Na2O=6.27±3.20 wt%, K2O=0.51±0.40 wt%, Na/Al=1.14, K/Al=0.95 (mean values, CI normalized). Fine-grained matrix S=1.7±1.6 wt%, n=17. Oxygen isotopes (Karen Ziegler, UNM) Oxygen isotope values of 3 acid-washed aliquots of bulk sample, 1.1, 1.3, 1.4 mg, gave δ17O = 3.589, 2.734, 2.839, δ18O = 5.511, 4.643, 4.201, Δ17O = 0.679, 0.282, 0.621 (linearized, all permil).

Classification: Ordinary chondrite (L3.00), type 3.00 based on ferroan olivine mean Cr2O3 content and sigma from Grossman and Brearley (2005) and by the presence of S-rich matrix. Comparison of Cr2O3 in ferroan olivines done using the same microprobe and conditions at UNM gave: NWA 7731 (L3.00) Cr2O3=0.43±0.11 wt%, n=98; Semarkona (LL3.00) Cr2O3=0.41±0.09 wt%, n=45. Oxygen isotopes appear to be relatively heterogeneous and fall within the same range of δ17O and δ18O as NWA 7731 (Ziegler et al., 2014). Apparent mean chondrule size similar to NWA 7731 (Agee et al., 2013). Weathering grade (W1). Possibly paired with NWA 7731.

Click on images below to view the full size image.


End Cut: 310.7g, 73mm (cut face) x 65mm x 48mm

NWA8276-310p7-f     NWA8276-310p7-a     NWA8276-310p7-b     NWA8276-310p7-c     NWA8276-310p7-d     NWA8276-310p7-e

This material is completely sold out. Pictures below are strictly for reference.


Partial crusted slice: 9.03g, 38.1 x 40.5 x 2.0mm (average, slight taper from 1.9mm to 2.7mm) –  SOLD

NWA8276-9p03-b     NWA8276-9p03-a


Partial slice: 0.45g, 12.7 x 10.5 x 2.3mm – SOLD

NWA8276-0p45-b     NWA8276-0p45-a     NWA8276-0p45-c


Partial slice: 0.94g, 18.3 x 11.0 x 2.6mm – SOLD

NWA8276-0p94-b     NWA8276-0p94-a     NWA8276-0p94-c


Partial crusted slice: 5.58g, 33.3 x 28.5 x 2.8mm – SOLD

NWA8276-5p58-a     NWA8276-5p58-b     NWA8276-5p58-c


Partial crusted slice: 9.02g, 40.3 x 44.6 x 2.3mm (average, slight taper from 1.9mm to 2.7mm) – SOLD

This slice has it all – note the carbonaceous inclusion!

NWA8276-9p02-b     NWA8276-9p02-a     NWA8276-9p02-c     NWA8276-9p02-d     NWA8276-9p02-e     NWA8276-9p02-f