Anne Black 4/10/2019 6:43:05 PM |
Hello Alex, Doug. Very nice piece Alex, but after multiple bad experiences, I have banned all membrane boxes, except for meteorites that contain absolutely no iron, no matter how well the pieces were prepared. |
MexicoDoug 4/10/2019 5:22:31 PM |
Alex, likewise my good friend, I look forward to seeing Homestead, not only a US classic, but itself from a town when the meteorite fell that was a communal government of persecuted Germans from the "Bleibetreu" commune! Now it's an inspiration to make another entry soon! |
Alexander Seidel 4/10/2019 10:05:42 AM |
Correction: next piece suggested as MPOD will be a 75-g-halfstone/endpiece from Holbrook AZ, U.S.A. But this will take a few days. [Neuschwanstein, Homestead etc - may be later...] |
Alexander Seidel 4/10/2019 9:24:22 AM |
Hi MexicoDoug, thanks again for the nice words - always a great pleasure to read your comments, my old meteorite friend! No, Neuschwanstein won*0*7t be next. But may be Homestead, a US classic from the 19th century. Not yet in the queue though... |
MexicoDoug 4/10/2019 8:51:02 AM |
....h where these membranes a primarily sold as being physically protective for fragile slices and shaped by providing a formed support and suspension so they do not slide and crack. |
MexicoDoug 4/10/2019 8:47:48 AM |
Such a beautiful slice of Bohemian history, Alex, thank you for submitting this for our viewing pleasure! And now - may you be on the hook for Neuschwanstein Castle :-) About the membrane boxes, I don't think they are especially effective for oxidation prevention but likewise they are not comparable to boxes and bags because the boxes and bags are trapping moisture inside with the specimen, and preventing all air circulation so that condensate sits on them for repeated periods when temperature varies. In the case of the membrane, it is more like a removable shellac. So if you start with a well curated specimen you have a removable protective skin upon which condensate will form and evaporate without contacting the underlying metal as long as it is placed inside dry. Just a guess :-) Would have to know the permeability of the membrane to oxygen - namely keeping oxygen out (which a plastic bag or box cannot do without other additions) This info no doubt is available in the patent, thoug |
Alexander Seidel 4/10/2019 4:52:58 AM |
Just to add: oh yes, I must have opened the box since there is my label inside, ROFL... :-) But then again it has remained closed for all those years. Membrane boxes don*0*7t seem to be bad after all. I have a Neuschwanstein (very rich in Fe) meteorite in another membrane box which also doesn*0*7t look bad at all after all the years... |
Alexander Seidel 4/10/2019 4:42:33 AM |
Hello Paolo, I can not answer your question professionally, as I am not so much an expert on rust-protection. All I can say is: I have kept this slice in the box for 14 years now, since I bought it from my Austrian collector friend. I never opened it, or may be I did shortly when I got it way back in 2005, not sure about that after all those years.. :-). That is because I have respect for the rarity of the specimen. Anyway, my observation is: it is still in perfect condition, it did not rust at all! So preserving or protecting it in this way cannot be a bad solution, by experience, and you should know that I am living in North Germany in a climate zone which is not very dry... |
Bernd Pauli 4/10/2019 4:30:11 AM |
A rare, historic beauty ... brecciated and gas-rich. Thanks for sharing! |
Paolo Conte 4/10/2019 4:25:03 AM |
Hello Alexander,
My compliments for this your slice.
I hace a question for you. You keep the slice in a membrane plastic box to avoid the rust. But I always have red isn't advisable to keep irons or H chondrites in plastic boxes because this favors the rust. But you make the opposite! Why? Write to progetto.andromeda@gmail.com |
Luca Fenocchio 4/10/2019 3:06:36 AM |
beautiful piece |
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