Dear collectors, its Special Time again! For our todays list-offer, we chose an in our eyes highly interesting meteorite: NWA 5245 A Rumurutiite, which isnt only unequilibrated but a true chondrules-wonder and absolutely unbrecciated.
Rumurutiites are an own group very distinct from all other chondrites, mainly they are much more oxidized and contain less metal for only naming two differences. Often a lot of sulphides are present, darkening the matrix and found here and there in shiny troilite grains. R-chondrites are very rare. If you add the tkws of all Rs listed in the Bulletin Database, you will end with a mere 28kgs, therefore Rumurutiites are twice as rare as rocks from Moon! A characteristic of almost all R-chondrites is, that they are strongly brecciated and heterolithic. An assemblage of fragments and clasts of lithologies of various petrological grades hence they stem from the regolith and debris layer on the surface of their parent body. (Btw. a reason, why many Rs got different petrological designation, although they are paired, because often the fragments were very small and therefore no decision can be felt, what could be matrix, what could be clast) Not so NWA 5245. It is absolutely unbrecciated, with S2 weekly shocked and with its 418 grams it had an diameter large enough, to see, that one hasnt hit by chance only a large clast. The other unbrecciated R, which comes to our mind, is the most common one, NWA 753. But and the pictures speak for themselves NWA 5245 isnt comparable, as its extremely chondrules rich. The density and the variety of chondrules is overwhelming and because additionally it seems to have a little bit more metal grains, than usually found in Rs, one could have taken it for an L3. A fantastic meteorite: Unequilibrated Type-3, unbrecciated, chondrules-rich, a W2 we think, its not exaggerated, if one would say, that this stone matches closest the most pristine and unchanged material of the Rumuruti-parent-body. For everyone being able to participate in this recovery, we set up in this special a series of small sized slices and an example for a large one and priced it at an affordable 25$/g. (average of all Rs on dealers pages, without expensive Ouzina, is about 35$/g and to call NWA 5245 an average R, wouldnt be appropriate). Here you are: http://www.chladnis-heirs.com/special-nwa5245.html Enjoy! Stefan & Martin Chladnis Heirs Munich Berlin Fine Meteorites for Science & Collectors ______________________________________________ http://www.meteoritecentral.com Meteorite-list mailing list [email protected] http://six.pairlist.net/mailman/listinfo/meteorite-list
