ПЕТРОГРАФИЯ, МИНЕРАЛОГИЯ И СТРОЕНИЕ МЕТЕОРИТА “ЧЕЛЯБИНСК”

The article presents the preliminary results of study of meteorite “Chelyabinsk” fragments. The slightly changed fragments, represent the aggregate of chondres and olivine and pyroxene porphyric-like crystals within fine-grained or crypto-grained matrix. The black vitrous-like matter with droplets of sulfides and nic-keliferous iron, and pores covers of meteorite fragments. Chemical composition of fragments is (mas. %): SiO2 – 39.73, TiO2 – 0.13, Al2O3 – 2.09, Fe2O3 – 4.34, FeO – 25.14, MnO – 0.36, MgO – 24.89, CaO – 1.80, Na2O – 1.05, K2O – 0.18, H2O–<0.10, P2O5 – 0.24, sum – 99.95. Non-ferrous metals (ppm): – Ni – 13200, Co – 618, Cr – 492, Cu – 137, Zn – 65, Li – 8.3. Average mineral composition (mas. %): x-ray amorphous matter – 35, iron-forsterite – 37, iron-enstatite, – 11, clyno-iron-enstatite – 2, albite – 8, troilite – 4, niceliferous iron – 3, <1%: apatite, ilmenite, copper, nicel, nicel sulfides, Cr-magnetite. Chemical composition of the olivine, pyroxene, plagioclase, troilite, and chromite is kept, but nickel content in iron wide varies.