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Met Type

Thin Sections

Thin section.   Achondrite-ung

TKW 345 grams. Fall not observed. Found 2012 in southern Morocco.

Anne writes:

NWA 8409, paired with NWA 7325.

The following text was supplied by John Kashuba (thank you, John).

Much has been written about this odd and beautiful meteorite including the possibility that it came from Mercury. Read David Weir's thorough, balanced and up to date digest of the work done on this material.

http://www.meteoritestudies.com/protected_NWA7325.HTM

Captions are largely adapted from Irving et. al.

Photo 1

Composition is approximately 56 vol.% feldspar (calcic plagioclase), 27 vol.% pyroxene (diopside) and 16 vol.% olivine (forsterite) plus accessory minerals. The plagioclase is mottled and somewhat birefringent. NWA 8409. View is 3mm wide.

Photo 2

The pyroxene exhibits at least two sets of polysynthetic twin lamellae, which resemble those produced by moderately high shock. View is 3mm wide.

Photos 3 and 4

Voids are present among the mineral grains (arrows). Views are 3mm wide.

Photo 5

Grain boundaries between plagioclase and diopside exhibit a complex texture consisting of plagioclase laths within diopside or vice-versa. View is 0.2mm wide.

  Click to view larger photos     #1     #2     #3     #4     #5

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