>We currently know of 15 different "solid phases" [...] >The form you're likely most familiar with is Hexagonal Ice [...]. If you keep lowering the temperature

>We currently know of 15 different "solid phases" [...] >The form you're likely most familiar with is Hexagonal Ice [...]. If you keep lowering the temperature of Hexagonal ice, it eventually becomes Cubic Ice; tweak the temperature and pressure further and you can create Ice II, Ice III all the way up to Ice XV. I've counted 16.