Description
CO 3.05. 0.301g part slice. sold in membrane box with label/certificate of authenticity.
The only CO 3.05 !
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Northwest Africa 11751 (NWA 11751)
(Northwest Africa)
Purchased: 2017
Classification: Carbonaceous chondrite (CO3.05)
Physical characteristics: Dark brown stone. Cut surface reveals an almost featurless dark brown interior.
Petrography: (J. Gattacceca, H. Pourkhorsandi, CEREGE ; Lydie Bonal, IPAG) Small chondrules (average apparent diameter 230±100 μm, N=22) set in a fine-grained iron-rich matrix. Chondrules 65 vol%, matrix 35 vol% (point counting, N=213). Small CAI are present. Based on the structural order of the polyaromatic matter assessed by Raman spectroscopy, this meteorite appears to be less metamorphosed than Colony (CO 3.1) and more metamorphosed than ALHA 77307 (CO 3.05). The Raman spectroscopy parameters of interest are FWHM-D (cm-1)=187.6±6.0, ID/IG=1.00±0.04 (see Bonal et al. 2016, GCA 189:312-337, figure 6).
Geochemistry: Olivine Fa10.4±10.0, range Fa0.7-25.4, PMD 91% (N=9), Cr2O3 in ferroan olivine 0.35±0.17 wt% (N=7). Orthopyroxene Fs3.6±1.4Wo3.8±2.0 (N=4). Magnetic susceptibility log χ (× 10-9 m3/kg)=4.69
Classification: Carbonaceous chondrite (CO3.05). Subtype from Raman spectroscopy and Cr2O3 content in ferroan olivine.
Specimens: Type specimen at CEREGE. Main mass with Fabien Kuntz.
