Carbon Fiber Blocks do not generate naturally in the world. They must be crafted with Unrefined Carbon Fiber Ingots, or with Coal Blocks. They require a Stone Pickaxe or better to mine.
Unrefined Carbon fiber blocks can only be obtained by crafting with Unrefined Carbon Fiber Ingots or with Coal blocks.
9 Unrefined Carbon Fiber Ingots are crafted into 1 Unrefined Carbon Fiber Block.
2 Coal blocks can be used to craft 1 Unrefined Carbon Fiber Block.
Unrefined Carbon Fiber Blocks can either be crafted back into Unrefined Carbon Fiber Ingots, or can be smelted into Carbon Fiber Blocks.
An Unrefined Carbon Fiber Block can be crafted into 9 Unrefined Carbon Fiber Ingots.
Unrefined Carbon Fiber blocks are smelted to obtain a Carbon Fiber Block.