Hi Mike and welcome to the NLC forum. Thanks for sharing those great halo images with us. I'm particularly fond of number 2 with the lake in the foreground. See a sundog on the W side of the halo. Is that a rare type of halo on the inside of the halo (R)?.
This halo is not an average one, but made by very rare pyramidal crystals, so you were really lucky to catch them! You can read about it at Les Cowley's site: atoptics.co.uk/halo/pyrhalo.htm Congratulations on these beautiful pics!