Mineral-petrographic and geochemical characteristics of the oxidized chondrite (Atakama, Chile)

We present our results of petrographic, mineralogical, spectral, chemical and elemental analysis of the meteorite. We determined that according to structural and textural features mineral and elemental composition, the studied meteorite is an ordinary olivine-enstatite chondrite of H4 petrological type. The predominant minerals are rhombic pyroxene and olivine. We determined the presence of sodium plagioclase, feldspar glass, chromespinelides, apatite, chlorapatite, barite, calcite, zircon, titanite, pyrrhotine, kamacite and taenite. Chondres were predominantly represented by radiant-fibrous, grate, cryptocrystalline and porphyry olivine and pyroxene monomineral varieties. We found chondres composed of fine-grained rocks and surrounded by a rim of carbonaceous matter. We determined inclusions of native platinum in the carbon matter and chromespinelides. The regularity of changes in the distribution of iron in the mafic minerals, composing the chondre, was established.