Name: LaPaz Icefield 02205 This is an OFFICIAL meteorite name. Abbreviation: LAP 02205 Observed fall: No Year found: 2002 Country: Antarctica [Collected by US Antarctic Search for Meteorites program (ANSMET)] Mass: 1226 g
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 (,6) Description: 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 Isotope Analysis: T.K. Mayeda and R.N. Clayton
Our analysis for LAP 02205 gives: δ 18 O = +5.6 and δ 17 O = +2.7. This is consistent with a lunar basalt.