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Old 12-18-2010, 06:46 PM   #9
ardeegee
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Quote:
Originally Posted by Worldwalker View Post
As far as the cave itself, consider its geology. Your typical cave is limestone, so any gems found in it would be those which could be found in limestone. You might want to do a bit of searching to find out what gems have been found in existing caves.
He could go with lava tubes, which are a good place to find crystals and gold. In fact, that is what a gold mine typically is-- a vein of solidified magma that has gold mixed in with quartz. As the magma flows through the tube, quartz and gold precipitate out of the melt early. The tube could completely fill with solidified magma, or it could remain hollow in the middle. Presto-- cave filled with various types of crystals and metals.

http://en.wikipedia.org/wiki/Quartz_reef_mining

http://www.google.com/images?um=1&hl...=&oq=&gs_rfai=
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