NWA 10620 (R4)

NWA10620(AJ16-1)aA small lot of five stones weighing a total of 254.15g was purchased out of Morocco in January of 2016. A sample of this stone was sent to Dr. Anthony Irving who determined the stone to be a very fresh R4 Rumuruti chondrite full of pentlandite and pentlandite rimmed chondrules, with a weathering grade of “low” and shock grade of 2..  The largest of the stones, a 131g crusted individual, was sent to the Montana Meteorite Laboratory to be sliced (I know…I know…how could I slice that). Slices feature a beautiful SUPER FRESH light grey matrix filled with chondrules and shimmering pentlandite. This Rumuruiti competes to be one of the freshest ever found, and is a true example of what Rumuruti chondrites really look like before they turn brown. Each slice will come in a quality labeled meteorite display box.

Petrography as follows:

NWA10620TS1NWA10620TS2NWA10620TS3 (Thin Section pictures compliments of Ray Watts)

Very fresh specimen consisting of separated, well-formed chondrules (mostly with apparent diameter 0.2-1 mm, but one 2 mm; some with pentlandite-rich rims) in a finer matrix containing relatively abundant pentlandite. Other minerals are olivine, orthopyroxene, clinopyroxene, sodic plagioclase, Ti-bearing chromite and troilite. Olivine (Fa39.4-39.6, N = 3), orthopyroxene (Fs29.9-30.7Wo2.4-3.0, N = 3), clinopyroxene (Fs11.0-11.1Wo45.0-45.1, N = 2), plagioclase (An9.0-13.7Or4.1-3.4, N = 2).

Meteoritical Bulletin entry can be found here.

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