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Lunar Meteorite: Pecora Escarpment (PCA) 02007Antarctica |
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The "bottom"
(left) and "top" (right) of the meteorite. (Thanks to Kathleen, Terry, & Cecilia for the photos.) |
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 Backscattered-electon image of PCA 02007, a regolith breccia. At the top and right is the glassy, vesicular fusion crust that occurs on the outside of the meteorite in the photos above; the vesicles are black in the image. At the bottom is the brecciated interior of the meteorite. Longest dimension: 1.3 cm. (Image courtesy of Ryan Zeigler) |
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 Transmitted-light photograph of the same thin section. |
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Small chips
of PCA 02007 in the lab (The green lines in the background are 2 mm apart. Click on image for enlargement.) |
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| Listed in The
Meteoritical Bulletin, No. 88, Meteoritics & Planetary Science
39, A215-A272 (2004)
from Antarctic Meteorite Newsletter, vol. 26, no. 2, August, 2003 PCA 02007Location: Pecora EscarpmentField No.: 13690 Dimensions (cm): 4.0x3.5x1.0 Weight (g): 22.372 Meteorite Type: Lunar-Basaltic Breccia [Author's note: PCA 02007 is a feldspathic breccia, not a basaltic breccia.] Macroscopic Description: Kathleen McBrideThis is a disk shaped meteorite with brown exterior on the top portion of the rock. The bottom face has tan colored, ropy glass with a frothy appearance. Polygonal fractures and various clasts of different sizes, shapes and colors can be seen. The interior is composed of a hard, dark gray matrix with white clasts. Underneath the tan ropy glass is a layer of shiny green glass.Thin Section (,4) Description: Tim McCoy, Linda WelzenbachThe section consists of an extremely fine-grained (melt?) matrix with isolated mineral grains and fine- to coarse-grained basaltic clasts in all size ranges up to 2 mm. Microprobe analyses reveal olivine of Fa27-33, pyroxene in a wide range of compositions from pigeonite Fs50Wo4 to augite of Fs19Wo43 with intermediate and more FeO-rich compositions, and plagioclase of An64-100 (with the most An96-100). The Fe/Mn ratio of the pyroxene averages ~53. The meteorite is a basaltic lunar breccia. |
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