geoff59
spending too much on rocks
Member since October 2022
Posts: 288
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Post by geoff59 on Oct 16, 2022 14:14:24 GMT -5
Hi
i’m curious is anyone here has ever tried tumbling meteorite specimens, let’s say ordinary chondrites, and if you have what we’re the results? Any photos? Thanks in advance.
-Geoff
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Post by vegasjames on Oct 17, 2022 4:16:33 GMT -5
As expensive as meteorites can be that would be a big waste.
And I doubt it would work very well. One problem is the iron nickel inclusions will be harder than the matrix by a lot giving a very uneven surface. And then you will also likely rust the metal inclusions ruining the meteorite.
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jimgsmith
starting to shine!
Member since September 2022
Posts: 37
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Post by jimgsmith on Oct 17, 2022 9:25:06 GMT -5
Hi i’m curious is anyone here has ever tried tumbling meteorite specimens, let’s say ordinary chondrites, and if you have what we’re the results? Any photos? Thanks in advance. -Geoff I think part of the attraction of meteorites is the texture that was created as it passed through space/atmosphere. I don’t think I’d want to remove that |
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Post by vegasjames on Oct 17, 2022 21:47:23 GMT -5
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dshanpnw
fully equipped rock polisher
Member since December 2020
Posts: 1,158
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Post by dshanpnw on Oct 18, 2022 7:08:43 GMT -5
You are correct jimgsmith. The flowlines and regmaglypts that form on some meteorites add value to the specimen. Here is am example of an oriented NWA 859 "Taza" meteorite from my collection with both flowlines on a nosecone and regmaglypts.    OMG! I would not do anything to those spectacular specimens. |
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dshanpnw
fully equipped rock polisher
Member since December 2020
Posts: 1,158
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Post by dshanpnw on Oct 18, 2022 7:11:48 GMT -5
No way would I tumble meteorites. They are just way too fascinating as they are. Just to have one would be good enough for me. I think I have seen somewhere on an online shop someone was selling polished ones though. Thanks for letting us take a look at them. I consider you very lucky to have them. Here is a sort video:
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RWA3006
Cave Dweller 
Member since March 2009
Posts: 4,625 
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Post by RWA3006 on Oct 18, 2022 7:18:53 GMT -5
Tumbling a meteorite would be a good way to ruin it's scientific and aesthetic value.
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geoff59
spending too much on rocks
Member since October 2022
Posts: 288
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Post by geoff59 on Oct 25, 2022 3:05:28 GMT -5
I should have clarified I guess, that I was thinking specifically about the ordinary chondrites types of stone, which have spent eons out in the deserts exposed to the elements. Some recovered meteorites have been there for a million years or more, and there is no fusion crust left, lots of weathering and oxidation has taken place. They have been changed so much from Earth-elements that little attention is given to them.
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RWA3006
Cave Dweller
Member since March 2009
Posts: 4,625
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Post by RWA3006 on Oct 25, 2022 7:04:42 GMT -5
I should have clarified I guess, that I was thinking specifically about the ordinary chondrites types of stone, which have spent eons out in the deserts exposed to the elements. Some recovered meteorites have been there for a million years or more, and there is no fusion crust left, lots of weathering and oxidation has taken place. They have been changed so much from Earth-elements that little attention is given to them. I still wouldn't alter them because the patina, oxidation, weathering, etc. is considered to be part of what makes them desirable among connoisseurs of meteorites. It represents a history or provenance or the specimen. |
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Post by vegasjames on Oct 25, 2022 8:52:49 GMT -5
I should have clarified I guess, that I was thinking specifically about the ordinary chondrites types of stone, which have spent eons out in the deserts exposed to the elements. Some recovered meteorites have been there for a million years or more, and there is no fusion crust left, lots of weathering and oxidation has taken place. They have been changed so much from Earth-elements that little attention is given to them. Still doubt if they would tumbler well. The chondrules would be harder than the matrix, which is why the chondrules sometimes weather out. Then the iron nickel inclusions are harder than the chondrules, and most likely would rust away in the tumbling process. Any iron sulfide inclusions would also be ruined by the water in the tumbling process. Even when cutting meteorites, which is done with water, the meteorites must be thoroughly dried immediately afterward to protect the iron nickel and the iron sulfide inclusions. |
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geoff59
spending too much on rocks
Member since October 2022
Posts: 288
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Post by geoff59 on Oct 25, 2022 9:09:53 GMT -5
I should have clarified I guess, that I was thinking specifically about the ordinary chondrites types of stone, which have spent eons out in the deserts exposed to the elements. Some recovered meteorites have been there for a million years or more, and there is no fusion crust left, lots of weathering and oxidation has taken place. They have been changed so much from Earth-elements that little attention is given to them. Still doubt if they would tumbler well. The chondrules would be harder than the matrix, which is why the chondrules sometimes weather out. Then the iron nickel inclusions are harder than the chondrules, and most likely would rust away in the tumbling process. Any iron sulfide inclusions would also be ruined by the water in the tumbling process. Even when cutting meteorites, which is done with water, the meteorites must be thoroughly dried immediately afterward to protect the iron nickel and the iron sulfide inclusions. I meant to ask you, is that a Sikhote-Alin specimen? The thumbprints are superb! |
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Post by vegasjames on Oct 25, 2022 9:49:26 GMT -5
Still doubt if they would tumbler well. The chondrules would be harder than the matrix, which is why the chondrules sometimes weather out. Then the iron nickel inclusions are harder than the chondrules, and most likely would rust away in the tumbling process. Any iron sulfide inclusions would also be ruined by the water in the tumbling process. Even when cutting meteorites, which is done with water, the meteorites must be thoroughly dried immediately afterward to protect the iron nickel and the iron sulfide inclusions. I meant to ask you, is that a Sikhote-Alin specimen? The thumbprints are superb! No, It is one of my NWA 859 meteorites commonly known as a Taza. My favorite meteorites, and often oriented. Here are a fee other of my Tazas:
This one is a 2.2kg Gibeon
Here is a really cool Canyon Diablo
I do have Some Sikhotes. I will have to find the pics.
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Post by vegasjames on Oct 25, 2022 9:54:54 GMT -5
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jimmie
starting to spend too much on rocks
Member since August 2021
Posts: 233
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Post by jimmie on Oct 25, 2022 13:03:12 GMT -5
Super cool!
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