Christophsis, or Christopher, was a strange Outer Rim planet covered almost entirely by giant blue-green hexagonal crystals. The landscape looked something like Superman's Fortress of Solitude. The crystals could be used in lightsabers... provided the lightsabers were hundreds of feet tall and hexagonal.
The planet was colonized by New-Age crystal gazers, who began extensive mining operations and eventually became rich and materialistic. During the Clone Wars, Christophsis was captured by Whorm Loathsom of the Confederacy of Independent Systems, but they were liberated by a Republic legion led by Obi-Wan Kenobi, Anakin Skywalker, and... ugh... Ahsoka Tano. How humiliating. So humiliating, in fact, that the entire population of the planet committed mass suicide by impaling themselves on the sharpest crystals on the planets surface, saving Darth Vader the trouble of having to destroy their planet later.