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Possible Meteorite ID Help

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#1 jmills224

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Posted 02 April 2013 - 01:42 PM

Hello,

A friend of mine's brother has found two possible meteorites. I don't know much about the subject so thought I would post some pictures for the experts here.

Magnets do stick to both objects but they aren't magnetic. They are very heavy for their size. About the only problem I see with them is that they don't have any surface features that appear to be burnt or melted to me.

Here are the pictures:
Posted Image
Posted Image

Are there any places in Oklahoma that would be able to authenticate these specimens? Do you guys have any opinions on what these may be if they are not meteorites?

Thank You

~J

#2 Glassthrower

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Posted 02 April 2013 - 02:26 PM

It's always impossible to make a definitive judgement from a photo, but I have seen a lot of photos like these. My guess, if I was a gambling man, is that these are terrestrial. However, it never hurts to have them checked out. First, take your toliet tank lid off, turn it over, and do a streak test with the specimen on the unglazed porcelain surface. If you see a black or red streak, it's not a meteorite.

I don't know of any specific places in Oklahoma, but you might try a university that has a planetary sciences department. I'm not personally familiar with any dealers in Oklahoma, but I can ask around.

Best regards,

MikeG

#3 jmills224

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Posted 02 April 2013 - 02:37 PM

Thank you Mike. I have let him know about the streak test. I'll report back after the test. I will contact our local university. They do have a planetary science department.

Thanks again.

~J

#4 jmills224

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Posted 02 April 2013 - 06:17 PM

He performed the streak test and it left light grey streaks. Looks like these are not meteorites. We are still going to cut one in half just to take a look.

~J

#5 oblako

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Posted 03 April 2013 - 10:47 PM

He performed the streak test and it left light grey streaks. Looks like these are not meteorites. We are still going to cut one in half just to take a look.

~J

Do not trust these streaks tests. I tried it with real meteorites, and the weathered ones produce a positive result.

#6 Glassthrower

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Posted 04 April 2013 - 10:49 PM

It helps to clean the surface of a specimen before streak testing it. I should have mentioned that. An outer layer of crud, caliche, desert varnish or other weathering products could produce a misleading result. If you grind off a window, you can visually inspect the interior and streak test the exposed area.

#7 jmills224

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Posted 08 April 2013 - 07:16 PM

I want to thank both of you guys again. I had an opportunity to lay eyes and hands on the two rocks. I think it's pretty obvious they are magnetite. There was no indication of a fusion crust and they contained cavities with some crystals around the edges. We filed an area and streak tested that area. It left a faint streak. I'm almost certain these are not meteorites.

He still wants to have them analyzed anyways. I think that is a good idea and he has located a person at our local university's geology department that will take a look.

Thank you

~J






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