Kivesvaara C2 chondrite: silicate petrography and chemical composition

KARI A. KINNUNEN and RISTO SAIKKONEN KINNUNEN, KARI A. and SAIKKONEN, RISTO, 1983: Kivesvaara C2 chondrite: silicate petrography and chemical composition.Bull.Geol.Soc.Finland 55, 1. 35-49.Fragments of the Kivesvaara meteorite were said to have been found in Paltamo, northern Finland in 1968.The chemical and mineral composition and the textural features show that this meteorite is a rare C2 carbonaceous chondrite.The research material consists of two fragments with traces of fusion crust (total weight 164 g).The meteorite is composed of a fine-grained phyllosilicate matrix (77.5 vol.%) and of clasts: amoeboid olivine aggregates and finegrained Ca-Al-Ti-rich aggregates (CAI inclusions), fluid drop chondrules and polymineralic fragments, monomineralic grains and fragments mainly of olivine, and opaque minerals.The clasts define a weak planar orientation and most of them are surrounded by black matrix rinds.The chemical composition of the Kivesvaara meteorite closely resembles Murchison C2 chondrite.