NWA 11125 (Polymict Eucrite Breccia)

One fusion crusted stone weighing 215.18g was purchased from a Moroccan dealer at the Tucson Gem and Mineral Show in February of 2015. A sample of this stone was sent to Dr. Anthony Irving who determined the stone to be a Polymict Eucrite Breccia with a low weathering grade and also a low shock stage. I cut and prepared the slices which come slightly polished on both sides. The slices feature a busy matrix filled with various clasts (including lithic clasts described as containing shocked polycrystalline plagioclase- a very highly shocked form of plagioclase rarely found in other eucrites). This stone is a beauty and would be a top contender an any collection. Each slice will come in a quality labeled meteorite display box.

Petrography as follows:

Breccia composed mainly of disaggregated eucritic debris, rare grains of diogenitic orthopyroxene, and some lithic eucrite clasts. Textures in lithic clasts range from fine intersertal to diabasic to equigranular, and one example of the last variety contains shocked polycrystalline plagioclase. Minerals include anorthite, ferropigeonite, exsolved pigeonite, fayalite, silica polymorph, ilmenite, troilite, chromite and minor barite. Low-Ca pyroxene host (Fs54.5Wo7.2, FeO/MnO = 32), high-Ca pyroxene exsolution lamella (Fs28.2Wo39.8, FeO/MnO = 37); orthopyroxene host (Fs37.9Wo2.9, FeO/MnO = 23), clinopyroxene exsolution lamella (Fs16.05Wo43.3, FeO/MnO = 31); ferropigeonite (Fs80.8Wo17.1, FeO/MnO = 42), diogenitic orthopyroxene (Fs31.9Wo5.1, FeO/MnO = 30), plagioclase (An90.3-92.1Or0.6-0.3, N = 2), fayalite (Fa90.2-94.8, FeO/MnO = 41-42, N =2).

Meteoritical Bulletin entry can be found here.

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