Description
Northwest Africa 13442 (NWA 13442)
(Northwest Africa)
Purchased: March 2020
Classification: Carbonaceous chondrite (CO3.0)
History: Purchased in March 2020 by Fabien Kuntz in Zagora.
Physical characteristics: Multiple fragments with fusion crust.
Petrography: (D. Sheikh, FSU) Small chondrules (150±50 µm, ~60 vol.%), isolated mineral fragments, and CAIs set in a mostly opaque matrix (~40 vol.%).
Geochemistry: Olivine (Fa21.9±16.3, range Fa0.4-57.3, FeO/MnO = 68±40, n=55), Cr2O3 in ferroan olivine (Cr2O3 wt% = 0.33±0.14, n=35), Low-Ca Pyroxene (Fs3.6±4.9Wo1.2±0.7, range Fs1.0-18.4Wo0.4-3.2, n=12).
Classification: Carbonaceous chondrite (CO3.0). Cr2O3 content of ferroan olivines suggest a low petrologic subtype similar to Y-81020 (CO3.0) and Colony (3.0) as reported in Grossman and Brearley (2005).
Specimens: 20.04 grams at UCLA; main mass with Kuntz.
