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See below.   Diogenite

TKW 12.57 kg. Fall not observed. Purchased September 2014, Zagora, Morocco.

Greg writes:

NWA 8744 Shock-melted Feldspathic Diogenite Breccia

NWA 8744 is a rare example of a highly shocked and vesiculated diogenite breccia. Among the numerous small vesicles, a huge 16mm x 42mm 'vug' was discovered in the 1356-gram stone and can be seen in the majority of slices as an oval 'hole' in the slices. The vesicles are primarily located in the gray melt zones and along the boundaries along the less-melted matrix zones.

This exciting new meteorite is classified as a melt-matrix breccia consisting of clasts of orthopyroxenitic diogenite, feldspathic diogenite and noritic diogenite plus related crystalline debris within a predominant, very fine grained, vesicular matrix. All orthopyroxene is turbid and pale clove brown in thin section and is notably ferroan; calcic plagioclase (anorthite) is polycrystalline. Some orthopyroxene contains irregular "patches" of clinopyroxene. Accessory phases are chromite, olivine and minor troilite blebs in orthopyroxene.

Individual image is of polished face of 225-gram end cut from 1356-gram mass and measures 102mm x 72mm x 34mm. Two group images; one of all 16 pieces of 1356-gram mass and second one displaying the 11 complete slices that the huge 16mm x 42mm vesicle was revealed.

  Click to view larger photos     #1     #2     #3

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