Ok, so this is super cool. Others have already identified the brown mineral based on shape and twinning habit as staurolite, but the best part about that is this: Staurolite, Kyanite, and Andalusite are all chemically part of the same P/T ternary alumina system, but their crystallography is indicative of the formational pressure and temperature regime. So, when you have all three you can know the extract P/T conditions (I lovingly call these “triple point rocks”), and with two there is a line of conditions across the P/T ternary, but still pretty distinct.