Thank you for the replies. The darker stone is 20.5cm *3.8cm while the lighter colored one is 20.4cm*3.4cm. Geology is not my field, and I know nothing of New Guinea’s rocks but I don’t think most schist would make a good axe. They are too large grained. I think you need an amphibole like what is called “black granite” or like what is called jade. The lighter colored stone might have been schist once but if you look closely you can see that the grains have fused together. The darker example is even tighter. Neither contains any mica that I can see, and only a few small spots that might be quartzite.
I have tried to take more detailed pictures of the dark one.
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