need help identifying this rock

Sep 26 15:37

Hello!  I have had this rock for about 25 years and I would love to find out what it is.  Can some help me identify this?  Thank you!

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Matt

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That looks like part of a

That looks like part of a mineral vein. Crystals will be deposited out of solution by water percolating through cracks...

I can't tell what the mineral is. It's often impossible to tell by picture alone. Try this mineral identification key:

http://www.rockhounds.com/rockshop/mineral_id/

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