NWA 4017 (10,580g)

Northwest Africa 4017
Northwest Africa
Find: 2005
Mesosiderite
History: An anonymous finder recovered a single stone of 216.9 g in 2005 from the western part of the Sahara in Morocco.
Petrography: (A. Greshake, MNB) A stony portion consists of dominant low-Ca pyroxene, plagioclase, and phosphates. Minor phases include silica, troilite, and small Fe,Ni metal grains. Pyroxene grains often contain numerous small Fe,Ni metal, troilite, and silica inclusions.
Geochemistry: Pyroxene, Fs25.5–40.8; plagioclase, An92.4 (total range An90.5–93.7). The metal is mostly kamacite.
Classification: Achondrite (mesosiderite) with low degree of shock and low to moderate degree of weathering.
Specimens: A 23.4 g type specimen and one polished thin section are on deposit at MNB. HSSH-Pirmasens of Germany holds the main mass.