Northwest Africa 5222
Classification: Achondrite Howardite
History and physical characteristics:
A small 60 g stone with little fusion crust and a heavily wind ablated surface was purchased in Erfoud, Morocco in October 2007. Petrography (J. Wittke and T. Bunch, NAU):
A howardite with many basaltic and at least two diogenitic lithologies together with many heavily shocked, dark clasts. One cumulate basalt contains maskelynite. One diogenite lithology contains 23 vol % plagioclase. Mineral compositions:
Subophitic basalt pigeonite is Fs55 9Wo7.8 (FeO/MnO = 30) and single grains of augite are Fs28.3Wo34.6. Low FeO cumulate basalt orthopyroxene is Fs34.6Wo3.8 (FeO/MnO = 26). Diogenite orthopyroxene is Fs22.6Wo2.0.
Name : NWA 5222 Class : A-Howardite, S2-4/W-low Region: Maroko Date : 10.2007 TKW : 60g Howardite with high capacity of iron.