ON THIS WIKI
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Abyssal Stone is a world generation ore block from the Railcraft mod. It generates in large Geodes beneath oceans. Geodes often contain Diamonds, Emeralds or Lapis Lazuli Ore. Like stone, Abyssal Stone can be cooked in a Furnace for Abyssal Blocks, which can be crafted into bricks, slabs, and stairs.
Abyssal Stone has Hardness 2 and Blast Resistance 6, while Abyssal Block and its Fitted, Brick, Stairs etc. derivatives have Hardness 5 and Blast Resistance 9. According to the Minecraft Wiki, this means at best they are on both stats comparable to Iron Doors on Hardness but with Blast Resistance at only 90% that of Wood.
With GregTech installed Abyssal Stone makes a good source of scrap, as quarries dig up this type of block in large amounts.