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Yes, a crystal made up of the "holes" found in semiconductors;
The material scientists must be having wet dreams 
Dr. Mordrid
Hugh DeWitt of Lawrence Livermore National Laboratory in California says that hole crystals and related phenomena occur in the super dense cores of white dwarfs and neutron stars. "We're at the point where we need to do serious quantum mechanical simulations of the interiors of stars," and the models done by Bonitz's group are very good examples of that, he says. Bonitz points out that hole crystals are not just strange curiosities--most matter in the universe is made up of positively and negatively charged particles like holes and electrons in extreme conditions that might be right for crystals. The hole crystal may be more common than we think.
Dr. Mordrid
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