I've never really fashioned anything this big out of stone and as a first project I was thinking of making an Incan stone mace. I don't have much experience with this type of stuff so I have no idea what material the head is made of. Some people say its made of flint but I feel as if those glass like rocks are too brittle to be used as a mace head. Does anyone know what types of stone I can use or is flint perfectly fine.

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The photo looks like granite.  Granite is probably a good place to start, but you could probably even do a decent replica even using some concrete formulation, maybe impregnated with some fibrous material to make it less brittle.