Bluestone Wall - Substance Material

I've lived close to Pentridge Prison for a number of years and was keen to capture the look and feel of the bluestone walls in a Substance material.
Pentridge prison closed almost 30 years ago yet the colossal, forboding bluestone permiter walls and cell blocks still stand today. The heavy bluestone blocks, no longer constrain infamous criminals like Ned Kelley or Mark "Chopper" Reid but instead form the perimeter of a new shopping and residential complex. A dramatic contrast to its former function.
There's a certain "weight" that stone walls like these hold within them. The inmates actually constructed the walls that imprisoned them, from quarrying the basalt rock to laying all of the blocks of the 20-foot-tall prison walls.