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Thin Sections

1226.3 grams. 10 x 8.5 x 5.5 cm.   Lunar (basalt)

Location Map of Antarctic Finds

AMN writes:

Macroscopic Description - Kathleen McBride

95% of the exterior surface has black fusion crust. Small areas of material have been plucked out. The fusion crust exhibits a slight ropy texture with polygonal fractures. The interior consists of interlocking tan and white coarse-grained minerals. There are numerous criss-crossing fractures filled with black glass.

Thin Section Description (,6) - Tim McCoy, Linda Welzenbach

The section consists of coarse-grained unbrecciated basalt with elongate pyroxene (up to 0.5 mm) and plagioclase laths (up to 1 mm) (~60:40 px:plag), rare phenocrysts of olivine (up to 1 mm) and interstitial oxides and late-stage mesostasis. Shock effects include undulatory extinction in pyroxene and shock melt veins and pockets. Microprobe analyses reveal pigeonite to augite of Fs26-80Wo14-36, plagioclase is An85-90Or0-1 and a single olivine phenocryst is Fa50. The Fe/Mn ratio in the pyroxenes averages ~60. The meteorite is a lunar olivine-bearing basalt.

Oxygen Isotopic Composition - T.K. Mayeda and R.N. Clayton

Our analysis for LAP 02205 gives: ä 18 O = +5.6 and ä 17 O = +2.7. This is consistent with a lunar basalt.

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