MinecraftForge/MinecraftForge — pull request #1146 by OvermindDL1 (2014-06-12 05:43:37+00:00)
Title: Update OreDictionary.java

Lapis Lazuli is *NOT* a dust, it is a rock, such as at: http://spiraltimes.files.wordpress.com/2012/11/lapis.jpg
Pretty sure that is what the MC Lapis Lazuli icon is based on as well, flip and rotate it and it matches.
Calling this "dustLapis" was a breaking change.