Sunstone

Sunstone is a block that spawns in the Solar Biome. It can take over stone and it into itself. It takes 90% longer than normal stone to mine, and can only be mined by a pickaxe with 200% pickaxe power.

Danger
Moonstone takes over any stone block. It also has a 30% chance to destroy a block, often creating random caverns.

Ores
Moonstone will also take over any ores in it's path. However, Ores take 50% longer to convert. So, ores can serve as a natural barrier.