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Lunar Meteorites: Kalahari 008 & 009 (paired stones)Botswana |
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Kalahari
009, with a bright 1-cm cube for scale. ( Photo courtesy of Addi
Bischoff) |
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Three views
of 2 small fragments (total mass: 0.28 g) of Kalahari 008, the feldspathic
stone.
The scale ticks are spaced at 1 mm. Click on image for enlargement. (Thanks
to Addi Bischoff for the samples) |
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Three views
of 3 small fragments (total mass: 0.26 g) of Kalahari 009, the basaltic
stone. Click on image for enlargement. (Thanks to Addi Bischoff for the samples) |
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from The
Meteoritical Bulletin, no. 89, Meteoritics & Planetary Science
40, A201-A263 (2005)
Kalahari 00820.9818°S; 22.9766° EKalahari, Botswana Found 1999 September Lunar meteorite (feldspathic regolith breccia) A single stone of 598 g was found in September 1999 by an anonymous finder in front of a sand dune within the Kalahari desert. The rock is an anorthositic breccia having typical clasts of lunar highland breccias (e.g., feldspathic crystalline melt breccias, granulitic lithologies, cataclastic anorthosites etc.) embedded within a well-lithified matrix. An impact melt spherule indicates that this rock derives from the regolith. The regolith origin is also supported by the finding of solar wind implanted rare gases (L. Schultz, Mainz). Classification and mineralogy (Anna Sokol and Addi Bischoff, Mün): olivine, Fa63±18; pyroxene Fs42±10; plagioclase An85-98. The shock stage of the rock is S4, the weathering grade is W1. Oxygen isotopic composition: d18O = +6.52‰; d17O = +3.32; D = -0.07‰ (R. N. Clayton, UChic); concentrations of selected elements (XRF or INAA; H. Palme, G. Weckwerth, Köln) in wt.%: Al: 14.68; Si: 20.73; Mg: 2.68; Fe: 3.5; Ca: 11.1. Specimen: Type specimen, 20g and polished thin section, Mün; main mass, anonymous finder. |
from The
Meteoritical Bulletin, no. 89, Meteoritics & Planetary Science
40, A201-A263 (2005)
Kalahari 00920.9818°S; 22.9766° EKalahari, Botswana Found 1999 September Lunar meteorite (basaltic fragmental breccia) A single stone of about 13.5 kg was found in September 1999 by an anonymous finder in front of a sand dune within the Kalahari desert, roughly 50 m apart from Kalahari 008. The rock is different from the Kalahari 008 anorthositic breccia. It has a heavily brecciated texture and is basaltic in composition. The sample does not contain solar wind implanted rare gases (L. Schultz, Mainz). Classification and mineralogy (Anna Sokol and Addi Bischoff, Mün): olivine, Fa50-99.9 (mostly Fa80-95); pyroxene is highly variable (Fs22-67 En10-64 Wo6-41); plagioclase An86-96 (very few plagioclase have more albitic composition, An70-80). The shock stage of the rock is S4; the weathering grade is W1; however, calcite veins are present. Oxygen isotopic composition: d18O = +6.87‰; d17O = +3.45‰ (R. N. Clayton, UChi); concentrations of selected elements (XRF or INAA; H. Palme, G. Weckwerth, Köln; Münker, Mün) in wt.%: Al: 6.76; Mg: 5.14; Fe: 12.47; Ca: 7.66. Zr/Hf = 30.2 and Nd/Ta= 17.4. Specimens: type specimen, 20 g and polished thin section, Mün; main mass, anonymous finder. |
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