When using the blockcrack or iconcrack particle id's in the particle command it returns with an unknown error.
On the wiki it said the particles are formatted like "blockcrack_(id)_(data)"
I've tried both numeric and string id's neither work, nor does just "blockcrack"
the same goes for iconcrack
http://gyazo.com/8d5264fdd1c36af503688be636a4f442 - screenshot of the most obvious format of a command
Fixed for a future version. MC-61033