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無球粒隕石,Howardite
2003年發現

 
A 985 g, very fresh stone with shiny fusion crust, was purchased in Rissani, July 2003.
Classification and mineralogy ( T. Bunch and J. Wittke , NAU ): a howardite of unusual characteristics. Fine-grained and powdery, average clast/grain size is <2 mm with few clasts >3 mm. Clast modes: diogenites, 74 vol. %; eucrites 20 vol. % (12 % cumulate, 8 % basaltic); anorthositic-like clasts, 3 vol. %, shock melt clasts, vol. 2 % and opaques, vol. 1 %. Diogenite orthopyroxene, Fs 35.6-38.8 Wo 2.3-4.2 ; plagioclase, An 87 ; chromite, Cr/(Cr+Al) = 0.81; metal, Ni = 0.67 wt. %. Melt inclusions in orthopyroxene contain Ca-rich pyroxene, Fs 33.3 Wo 37.5 , phosphate, silica phase, and K-rich glass. Plagioclase-pyroxene cumulates, Fs 38.2 Wo 21 ; plagioclase, An 86 . Other eucrite textures include recrystallized, granular, ophitic, subophitic, and variolitic (Fs 31.6 Wo 7 and Fs 61.8 Wo 33 ). Plagioclase-rich clasts have 95 vol.% plagioclase (An 96.1 ). Shock level, S2; no apparent oxidation or Fe-staining.



 
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