Undara Volcanic

Undara Volcanic is a national park in North Queensland, Australia and is notable for its lava tubes and gem fossicking. Minerals found there include topaz, moonstone, peridot, aquamarine, garnet, quartz and gold. The park contains the remains of the Earth’s longest flow of lava originating from a single volcano. The park is remote, and accessible from the regional centres of Townsville or Cairns.

• http://en.wikipedia.org/wiki/Undara Volcanic