NWA 10507 (CO3.0)

NWA10507MMA 266.2g crusted stone was purchased out of Morocco in October of 2015. The stone was classified by Dr. Anthony Irving to determined the stone to be a CO3.0  Ornans-type carbonaceous chondrite with a shock grade of 2 and weathering grade of 0. The CO3.0 classification groups this chondrite with only a handful of others which are among the most primitive and least-metamorphosed carbonaceous chondrites. Slices were prepared by Montana Meteorite Laboratory and are slightly polished on one side.  Each slice comes in a labeled and padded meteorite display box. Only about a half dozen full slices will be available.

Petrography as follows:

CO3.0 chondrite (S2, W0) Small, well-formed chondrules (apparent diameter 0.55 ± 0.3 mm), mineral fragments and sparse, irregularly-shaped CAI are set in a deep brown matrix (~50 vol.%). Olivine (Fa1.0-89.4, Cr2O3 in ferroan olivine 0.20-0.84 wt.%, mean 0.38 wt.%, sd 0.15 wt.%, N = 20), orthopyroxene (Fs1.3-4.7Wo1.1-3.4), clinopyroxene (Fs1.6Wo47.7; Fs18.6Wo47.5).  The mean and range of Cr2O3 contents of ferroan olivine occurring as rims and as matrix grains is essentially the same as for Colony, which was designated as a CO3.0 by Grossman and Brearley (2005, Figure 5).

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