Some basic rocks
Stone is the first of the basic building blocks. It's normally found near the surface and goes deep underground. It's by far the most common block. It produces cobblestone if mined with a wooden pickaxe or better. It sometimes has gold, iron or coal deposits inside it when below ground, diamond deposit can be also found in the indev version. New block can be crafted by smelting cobblestone in a furnace. It is not affected by gravity.
Crafting
Stone is used a few crafting recipes: Buttons, and Stone Pressure Plates.