St. Lawrence University: February 7th, 2018
Contains: Crystal with broad branches (P1c), elementary sheath (N1c), hollow bullet (C1d) and a bundle of elementary sheaths at one location (N1d).
Temperature formed was at -15 degrees, right at the water saturation line with 89 % average humidity. There were at least two different nuclei present with changes in temperature and increased humidity occurring between the branch growth.