These rocks mainly occur in layers called strata. They cannot currently be made into bricks or cobblestone and in the future they will have more uses
These volcanic rocks can be found in large quantities and make up most of the rock found in certain areas. They drop igneous cobblestone when mined. They can be crafted into bricks
These rocks are formed by heat and pressure underground and make up the rest of the landscape where igneous rocks do not occur. They drop metamorphic cobblestone when mined and can be crafted into bricks.
Anthracite and Lignite:
Anthracite is a very pure form of coal. It can be made by crafting four peices of coal and burns for 32 items. Lignite is an item dropped from lignite rock. It is a very impure form of coal and burns for 1 item in a furnace. It can be found in large deposits.