I agree, this is a very different Acropora, but A. teres has a very flat surface. The radials are just light bumps. Yours has tubular, lightly appressed radials with round openeings. There are two distinct sizes of radials, the smaller just exert.
A. austera is similar, but has more crowded radials of various sizes.
Both species could show this blue-black colouring. Do you have a foto of the mother colony?