Sylvite
Walker D, Verma P K, Cranswick L M D, Jones R L, Clark S M, Buhre S
American Mineralogist 89 (2004) 204-210
Halite-sylvite thermoelasticity
Sample: r57765, T = 200 C, P = 5.5 kbar, cell volume = 245.23 ang**3
_database_code_amcsd 0003210
6.2593 6.2593 6.2593 90 90 90 Fm3m
atom  x  y  z
K     0  0  0
Cl   .5 .5 .5