Edgar Hollis' Cricket Ball

Origin
The Crystal Cave is located in Bermuda, which features many underwater caverns and limestone formations. Containing beautiful stalagmites, stalactites and clear pools, parts of the cave have been damaged by earthquakes in the past. Schoolboys Carl Gibbons and Edgar Hollis found it in 1905 when they went searching for a lost cricket ball.

Effects
Whatever it contacts will quickly experience crystal growth around it. If touching for long enough, some of the object will begin to transform into crystal. Denser than the starting seed crystals, it remains sturdy to most trauma except for strong vibrations.