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 Post subject: pegmatite vein
PostPosted: Sun Jan 14, 2007 5:56 am 
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Joined: Fri Jan 12, 2007 3:11 am
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Location: Kathmandu , Nepal
Hi Friends ,
How & where to find pegmatite vein . Is there any GPS that helps us to locate or find gems deposite.
looking to hear


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PostPosted: Sun Jan 14, 2007 10:44 am 
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Location: San Francisco
I think if you want to find pegmatite veins it would be wise to hire a team of geologists.


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PostPosted: Sun Jan 14, 2007 3:08 pm 
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niyatri,

Do you intend to find existing strikes? Are you looking for a database of known sites? Or, rather, are you looking for a way to find NEW areas that haven't been previously discovered?


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 Post subject: Harding mine
PostPosted: Sun Jan 14, 2007 6:32 pm 
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The Harding Mine in Dixon, New Mexico, usa is one of the top pegmatite examples in the u.s. The owner, a PhD geologist, donated the mine to the Univeristy of New Mexico, who has it open to the public for collection and research. It is apparently one of the largest open pegmatite structures in the world. There are other pegamatite examples on the web, The Pala mine in san diego (tourmaline) is on the web, with excellent photos. There are also some good photo's of the Maine pegmatites as well.

Google will guide you to the imagery and there are several online university course notes that will give you the theoretical background.

Then all you have to do is go around kathmandu and look, i'm sure Nepal has lots of examples.


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PostPosted: Mon Jan 15, 2007 3:46 am 
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Whatever these rocks are, they sure do have a fan club already! 8)

There is an organized Pegmatite Interest Group at MSA (http://www.minsocam.org/). Not sure what these guys do, but you might want to try them out if not done already.


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PostPosted: Mon Jan 15, 2007 3:13 pm 
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Niyatri,
Is there any organized government geological survey (with maps or other data) of the region you wish to explore? If so that should be your first resource to learn where surface-reaching magmatic intrusives like pegmatites or contact metamorphism are likely to occur.

You'll have to know enough basic geology to recognize such areas when you find them as well as how to distinguish graphic granite from "regular" granite, etc. You'll also need to know where gems may exist within such structures. Past mining activity can be a good indication of future possibilities but has the disadvantage of leading to you areas that are probably either mined-out or previously prospected. Still there's an enormous amount to be learned from such sites.

You can gain an overview of the problems/possibilities by reading "Gemstones and Minerals," an excellent book on the topic by the late John Sinkankas. It's available used from several on-line sources. While written mainly with an American readership in mind it contains a treasure trove of detailed information about prospecting, geology, pocket mining and much else. It was published in 1961 but the information it contains is as fresh and vital as it was then.

Good luck! I'd really love to join you but I don't climb gigantic mountains (or even little hills!) as well as I used to.

_________________
Rick Martin

www.artcutgems.com


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