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Hola Forists. We sanded two small unc. meteorites and in reflected light, we see two arrangement of the iron nickel flecks.

¿ Can anyone tell us if there is a name for these different patterns of distribution of the iron-nickel ?. Below the two pictures.

Hasta la vista,

larense

post-879-1187500379_thumb.jpg

post-879-1187500421_thumb.jpg

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Hola:I think,normally that would be oriented crystal patterns,but,it is probably iron/nickel and troilite inclusions located side by side.I have seen that in a few of my stony meteorites.Hope this helps.and by the way if you polish the cut surface to about 320 grit and spray with crystal clear acrylic the troilite will almost disappear and the metal will stand out.And a beautiful meteorite structure will appear using a 10x magnifying lens,under bright light.Try it, you will like it.

Best Regards;Herman Archer IMCA #2770

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Hola Mr. Archer. Thank you very much for your opinion and advice. BTW, from another forum we received this picture :

block_metal.jpg

...and this answer :

Hello larense,

Is that shiny metal, or does it look more like polished hematite? Many weathered chondrite have oxide veins.

Below is a picture showing very fine shiny metal along with some of the veins to which I'm referring.

Now, we kindly want to ask you, Mr Archer, if these hematite veins were before pure iron-nickel shock veins, that latter oxidaded to hematite, cause they look like as if they belong to the matrix and not formed afterward.

Hasta la vista,

larense

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Hello Larense;The shock veins in question were present in the meteorite upon arrival to terra firma.Fresh shock veins are a mixture of iron bearing minerals and very fine grains or blebs of elemental iron/nickel,co.Ir. and so on.They have oxidized in situ over time to be a form of hematite or magnetite.Hope this helps.

Best Regards;Herman Archer IMCA#2770

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Hola again, Mr. Archer. Thank you so much for your reply. BTW, ¿ Does a fresh shock vein shines at reflected light or it is a black line in the matrix without any reflective properties ?

Wishing you all the best,

larense

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Hello Larense:

Most of the meteorites that i have that are relatively fresh and have shock veins are not as reflective in the shock vein area as weathered ones.I will attach some pictures of a W1-L6 chondrite NWA 1766.It shows some great shock veins and they are visible on broken surfaces as well.

Best Regards:Herman Archer IMCA#2770

post-795-1188095420_thumb.jpg

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Hola Mr. Archer. Thank to you, we have now a better understanding about fresh and weathered condrites, and the mineral composition of fresh and weathered shock veins.

Wishing you all the best,

larense

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