NWA 8505

North West Africa
Find, 2014

Mesosiderite
Half specimen, 635g
Size: 12,0 x 5,5 x 4,8 cm

Remarks: Piece have some fresh crust

History:
A single stone was purchased from a Moroccon meteorite dealer Rachid Chaoui in Zagora in 2014. Piece was acquired together with Tomasz Jakubowski and cut to half. A piece was send to analysis to dr Ansgar Greshake , MNB. We (Jarkko Kettunen and Tomasz Jakubowski) donated a slice of this meteorite to the Mineralogical Museum in the University of Wroclaw in Poland.

Petrography:
The meteorite consists of about 60% silicates and 40% Fe-Ni metal. Silicate portions contain abundant low-Ca pyroxene and calcic plagioclase as well as minor augite, olivine, silica, and merillite.

Geochemistry:
low-Ca pyroxene: Fs30.1±2.2Wo3.3±0.8 (Fs25.1-32.4Wo1.9-4.2, n=22), FeO/MnO=18-30; Ca-pyroxene: Fs14.6±1.1Wo41.2±0.7 (Fs12.8-17.1Wo39.9-42, n=10), FeO/MnO=17-26; calcic plagioclase: An92.9±1.2 (An90.4-95.1, n=19)

Specimen Description:
This is very fresh mesosiderite with beauty preserved fusion crust on the outside of the piece.  Especially interesting is a fusion crust on silicate parts reminds a HED like crust.

Reference:
Meteoritical Bulletin Database