Post subject: How can I tell if what I have is coltan?
Posted: Sun Mar 06, 2016 8:21 pm
New to the Forum or The Quiet Type
Joined: Sun Aug 17, 2014 2:37 pm Posts: 8
I recently went on a trip to Mexico around Queretaro where I was told there were meteorites, and I came upon a metallic rock. I know it's not a meteorite because I already had a meteoroligist test it. The closest type of metal to me that it looks like it's coltan, but I don't know for sure if it is. I wanted to know from someone that is familiar with metals what could this possibly be?
Post subject: Re: How can I tell if what I have is coltan?
Posted: Mon Mar 21, 2016 2:28 pm
Valued Contributor
Joined: Thu Mar 15, 2007 11:50 pm Posts: 299 Location: Virginia, USA
"Coltan" is columbite-tantalite, typically small black tabular crystals with the corners lopped off. Their source is a pegmatite rock, usually hosted within (or close to) a mass of granite. The rock in the video closely resembles an iron mineral such as limonite or "ironstone."
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