[meteorite-list] NWA 753 (R3.9) and NWA 755 (R3.7)
Mike wonders: I wonder if there is any chance they are paired in some way? Judging from what the Met.Bull. says, I'd say no, they are not paired: NWA 753: S2; W2 with sulfides well preserved NWA 755: S2; W4 with most sulfides destroyed Best wishes, Bernd __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] NWA 753 (R3.9) and NWA 755 (R3.7)
Hi Bernd, Mike and all, They both have pseudonyms of Kem Kem and found/purchased in 2000. How do you know which is which? Anyway, I thought NWA 001 was AKA Kem Kem. Oh well. Carl Mike wonders: I wonder if there is any chance they are paired in some way? Judging from what the Met.Bull. says, I'd say no, they are not paired: NWA 753: S2; W2 with sulfides well preserved NWA 755: S2; W4 with most sulfides destroyed Best wishes, Bernd _ Express your personality in color! Preview and select themes for Hotmail®. http://www.windowslive-hotmail.com/LearnMore/personalize.aspx?ocid=PID23391::T:WLMTAGL:ON:WL:en-US:WM_HYGN_express:082009 __ http://www.meteoritecentral.com Meteorite-list mailing list Meteorite-list@meteoritecentral.com http://six.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] NWA 753
Mark, Your ideas sound reasonable. I have yet to consider this level of protection. Pieces like 753 go in membrane boxes for me...which are somewhat protective. However, the relative lifespan for all things in this earthly environment is a matter of decay. Some meteorites will go faster than others. Hopefully it takes more than a few generations. Remember, a lot of these things (finds) have been around for awhile already. Just keep them away from moistureand from Nantans and Brahins and Campos and Ghubaras and shales, etc. John - Original Message - From: mark ferguson [EMAIL PROTECTED] To: John Divelbiss [EMAIL PROTECTED] Cc: [EMAIL PROTECTED] Sent: Tuesday, February 11, 2003 11:06 PM Subject: Re: [meteorite-list] NWA 753 Hi John, Tom and list John, would a inert invironment help sabilize this oxidation? Like vacuum sealing them in a food storage bag like whats advertised on the tv? Or, for a more pleasing display, one of the little globes used for opal with the large rubber stopper back filled with helium (helium is easy to get from local stores which they fill ballons with is why I mention it). I'm always wondering about long term storage because, as you know, once something starts oxidizing, it often does so very quickly. Mark --- John Divelbiss [EMAIL PROTECTED] wrote: Tom, First off, many of R pieces from the desert are oxidized a bit. According to Rocks from Space, these meteorites have very little free metal floating around in the makeup. Like normal chondrites with nickel iron. The metal is in the sulfide forms of pyrrhotite and pentlandite. The iron level in the olivine is the highest among chondrites. All that gives this type of meteorite a higher rate/chance of oxidation than others. Hope this helps, John - Original Message - From: Tom aka James Knudson [EMAIL PROTECTED] To: meteorite-list [EMAIL PROTECTED] Sent: Tuesday, February 11, 2003 6:58 PM Subject: [meteorite-list] NWA 753 Hello List, I have a slice of NWA 753. It has some rust colored spots through out the matrix. What Am I looking at? If it is rust, what rusted? Thanks, Tom The proudest member of the IMCA 6168 __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Do you Yahoo!? Yahoo! Shopping - Send Flowers for Valentine's Day http://shopping.yahoo.com __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NWA 753
Hello List, I have a slice of NWA 753. It has some rust colored spots through out the matrix. What Am I looking at? If it is rust, what rusted? Thanks, Tom The proudest member of the IMCA 6168 __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] NWA 753
Tom, First off, many of R pieces from the desert are oxidized a bit. According to Rocks from Space, these meteorites have very little free metal floating around in the makeup. Like normal chondrites with nickel iron. The metal is in the sulfide forms of pyrrhotite and pentlandite. The iron level in the olivine is the highest among chondrites. All that gives this type of meteorite a higher rate/chance of oxidation than others. Hope this helps, John - Original Message - From: Tom aka James Knudson [EMAIL PROTECTED] To: meteorite-list [EMAIL PROTECTED] Sent: Tuesday, February 11, 2003 6:58 PM Subject: [meteorite-list] NWA 753 Hello List, I have a slice of NWA 753. It has some rust colored spots through out the matrix. What Am I looking at? If it is rust, what rusted? Thanks, Tom The proudest member of the IMCA 6168 __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
Re: [meteorite-list] NWA 753
Hi John, Tom and list John, would a inert invironment help sabilize this oxidation? Like vacuum sealing them in a food storage bag like whats advertised on the tv? Or, for a more pleasing display, one of the little globes used for opal with the large rubber stopper back filled with helium (helium is easy to get from local stores which they fill ballons with is why I mention it). I'm always wondering about long term storage because, as you know, once something starts oxidizing, it often does so very quickly. Mark --- John Divelbiss [EMAIL PROTECTED] wrote: Tom, First off, many of R pieces from the desert are oxidized a bit. According to Rocks from Space, these meteorites have very little free metal floating around in the makeup. Like normal chondrites with nickel iron. The metal is in the sulfide forms of pyrrhotite and pentlandite. The iron level in the olivine is the highest among chondrites. All that gives this type of meteorite a higher rate/chance of oxidation than others. Hope this helps, John - Original Message - From: Tom aka James Knudson [EMAIL PROTECTED] To: meteorite-list [EMAIL PROTECTED] Sent: Tuesday, February 11, 2003 6:58 PM Subject: [meteorite-list] NWA 753 Hello List, I have a slice of NWA 753. It has some rust colored spots through out the matrix. What Am I looking at? If it is rust, what rusted? Thanks, Tom The proudest member of the IMCA 6168 __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list __ Do you Yahoo!? Yahoo! Shopping - Send Flowers for Valentine's Day http://shopping.yahoo.com __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NWA 753 and NWA 978
Hello Mark, Matteo, John, Dean and List, John Divelbiss wrote: My comparison is that my two slices of 978 looks a lot fresher than my two 753 slices First let me thank you for those great pictures but studying them, leaves me a little confused :-( Reason: Both Mark's and Matteo's NWA 753 specimens look like my NWA 978 from the Hupés (the one with the soft glow of the Milky Way in my description) whereas my NWA 753 from Jim Strope has conspicuous grayish-white slightly oval chondrules (definitely larger than the ones in my 978), is a much lighter gray color and looks fresher than my 978. Fresher would support the description you find in: BISCHOFF A. et al. (2001) Mineralogy, Chemistry, and noble gases of the unpaired Rumuruti chondrites NWA 753 and NWA 755 (MAPS 36-9, 2001, A021): Mineralogy: Northwest Africa 753 is a quite fresh (W2) R3.9 chondrite, which is unbrecciated in thin section. The rock is probably one of the f r e s h e s t Rumuruti samples besides Rumuruti. Cheers, Bernd __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
[meteorite-list] NWA 753 and NWA 978
John inquired: Can anyone tell me if any of the different numbered NWA R-chondrites are paired? Like NWA 753 and 978, both R3.8's Hello John and List, According to the Meteoritical Bulletin #85, NWA 753 is a R3.9 rumurutiite chondrite, and its fayalite is Fa38.6±3.2 (range Fa20-41) and: NWA 978 is classified as an R3.8 chondrite in Met.Bull. #86 with a slightly higher Fa value of: Fa41.9±0.2 In other words, they are probably unpaired. Best regards, Bernd __ Meteorite-list mailing list [EMAIL PROTECTED] http://www.pairlist.net/mailman/listinfo/meteorite-list
