Ash Block

Ash blocks are blocks made from ash.

Mining
Ash blocks can be mined with any hoe.

World generation
Ash blocks (not to be confused with Ash piles) can be found naturally when a forest or tree catches on fire from nearby lava, albeit, extremely rarely, as for an ash block to be made naturally, ash piles must fall on top of each other and stack up together into a full ash block.

Miscellaneous
Ash blocks can be made if enough ash piles fall on top of each other until they become a full block.