Newsletter |
36,2 |
Location |
Szabo Bluff |
Field Number |
24328 |
Dimensions (cm) |
9.5 x 6.5 x 5.5 |
Weight (g) |
443.13 |
Original Classification |
CO3 Chondrite |
Updated Classification |
CM2 Chondrite |
Fayalite (mol%): 0-40;Ferrosilite (mol%): 2 |
Ce |
B/C |
The exterior is a very dark, rusty brown color with vugs and evaporites and has no fusion crust. The interior of this carbonaceous chondrite is very weathered with a brown oxidation rind. The center of the meteorite is less weathered and reveals a black matrix. |
The section consists of abundant small (up to 1 mm) chondrules, chondrule fragments and mineral grains in a dark matrix. Rare metal and sulfide occur in the matrix. Olivine ranges in composition from Fa0-40, with a continuous range of intermediate compositions and a slight peak at Fa1-5. One pyroxene analyses shows from Fs2Wo1. The matrix appears to consist largely of Fe-rich olivine. The meteorite is a CO3 chondrite. |
Oxygen isotopes and overall petrography both indicate re-classification from CO to CM chondrite is justified. Both delta 18O and delta 17O are both positive and within the field of CM chondrites. |