Citrine Geode. Citrine is a type of Quartz. While Quartz is the second most common mineral in the Earth's crust (first being feldspar), Citrine, Quartz with iron impurities is somewhat uncommon. It can, however, be artificially created, apparently by heating amesthyst or smoky quartz, two more common forms. The biggest producer is Brazil and in particular, the state of Rio Grande do Sul.
The picture above is a close-up of a rather large geode (and heavy I might add) that I found at the state fair many years ago. While those large geodes look awful pretty, carrying them back to the car (from the tent in this case) is enough to disuade most would be purchasers.
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