Ebonstone Block

The Ebonstone Block is a type of block that comprises Chasms. It can only be mined with the Nightmare Pickaxe or better. Dynamite and bombs will blow it up. Purification Powder will turn it into regular Stone blocks, while Holy Water will turn it into Pearlstone.

Trivia
There is a bug that causes the ebonstone to have blue lines parrallel to eachother when in water.