Sunstone Crystal

Sunstone Crystal is a type of crystal first developed and used on the planet Krypton, both as a building material and as a form of computer system.

Similar in nature to organic lifeforms, a sunstone crystal can be "shaped" to serve specific purposes. Some, when activated, can duplicate their mass; forming structures such as buildings or vehicles. Others shape themselves into hive-like nests to act as computer systems. While others again can serve as small communicative devices or tools and instruments.

Trivia

 * Several incarnations of the Fortress of Solitude are made mainly from sunstone crystals, or otherwise incorporate them into its design.
 * Supergirl posseses sunstone crystals within her body which were surgically imbedded by her father as a weapon against Phantom Zone "ghosts".