Mike, all, The paper you probably refer to is G. SURESH et al.: “Katol Meteorite Shower, Maharashtra: A Preliminary Study“ from the Journal of the Geological Society of India, dated February 2013. The paper includes preliminary petrologic and chemical data. According to the findings of the authors, in Katol “Ni varies from 4.5 to 29 wt %“, which is not suprising, considering, the pure-iron individual that have been collected.
Quote: “In the Katol meteorite, chondrules were recrystallised into medium to coarse rounded granular aggregates or as single euhedral crystals. The shapes of the chondrules are preserved and it can easily be delineated by encircling of medium to coarse grained Fe-Ni /troilite rims. It comprises of reconstituted chondrules (67%), matrix (20%), refractory minerals (1%) and metal volume percentage (12 %), which is typical of ordinary H type meteorite category (Scott et al., 1996). Properties such as the homogeneity of Mg composition in olivine and pyroxene, presence of clinoenstatite, interstitial untwinned plagioclase feldspar (30 to 50 μm size), absence of chondrule glass in the matrix (glass occur as inclusions within the olivine at places), presence of kamacite-taenite exsolution grains i.e. Ni 29 % in the metal and insignificant Ni concentration in sulphides i.e. > 0.5 % also suggest their H-type nature.“ End of quote. In their conclusion, the authors state that “based on the present studies, the Katol meteorites are classified as ordinary olivine rich H5 type reconstituted chondrite and shows differentiated nature. “ In context with an (equilibrated) chondrite, however, I am not familiar with the terms “reconstituted” and “differentiated”, so others might jump in to explain what they refer to. The source: http://tinyurl.com/nu29ubf Cheers Svend > Galactic Stone & Ironworks <meteoritem...@gmail.com> hat am 1. Oktober 2013 >um 18:36 geschrieben: > > > Hi List, > > Last night I heard something puzzling. > > A collector/scientist that I know says that he read a paper published > by GSI that claims Katol is an H5 chondrite. I asked him for a link > to the paper or more info on it, and I am still waiting to hear back > on that. > > In the meantime, this has me wondering. I have seen a lot of H5 > chondrites over the years. I have seen fresh H5 falls and weathered > H5 NWA stones. I have never seen an H5 (or any H-chondrite) that > resembles Katol. I have a hard time believing that this meteorite is > an H. The pieces I have seen (many, ranging in size from crumbs to 2+ > grams, whole and fragments) do not look like chondrites at all. I > have heard reports of specimens that have chondrules, but I have not > seen any. I also heard reports of a specimen that is entirely metal > and another one with crystalline inclusions. If those reports are > credible, and based on the green matrix and crystalline texture, then > I doubt this is an H-chondrite. > > Does anyone have a link to this GSI paper or more info about it? > > Best regards, > > MikeG > > -- > ------------------------------------------------------------- > Web - http://www.galactic-stone.com > Facebook - http://www.facebook.com/galacticstone > Twitter - http://twitter.com/galacticstone > Pinterest - http://pinterest.com/galacticstone > ------------------------------------------------------------- > ______________________________________________ > > Visit the Archives at http://www.meteorite-list-archives.com > Meteorite-list mailing list > Meteorite-list@meteoritecentral.com > http://six.pairlist.net/mailman/listinfo/meteorite-list ______________________________________________ Visit the Archives at http://www.meteorite-list-archives.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
