|1Semenenko, VP, 1Gorovenko, TM |
1M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine, Kyiv
|Dopov. Nac. akad. nauk Ukr. 2017, 9:76-83|
The original and literature data on the findings of filiform crystals (FFC) in meteorites are given. It is shown that they have pre-terrestrial and terrestrial origins. Rhabdite crystals in iron meteorites and pallasites, taenite ones in ataxites, and graphite ones in carbonaceous xenoliths of chondrites are the most common among the pre-terrestrial FFC. It is assumed that their formation is a result of solid phase transformations during the slow cooling of meteorite parent bodies. Unlike them, the olivine and Ca-pyroxene FFC within a fine-grained matter of chondrites and Fe,Ni-metal FFC in pallasites are rare. The morphological characteristics of the meteoritic FFC are similar to those of the artificially grown ones, although they differ by a narrower variety of crystallographic forms and the priority of formation conditions.
|Keywords: filiform crystals, metamorphic transformation, meteorites, minerals, origin|
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