What physical parameters determine the scale of columnar jointing?
- What makes the columns thinner or thicker?
- What makes them taller or shorter?
- What causes the variation in a given site?
- What makes the polygons more/less regular?
I'm guessing factors include internal temperature, cooling timescales, composition, etc, but the literature seems to be a little uncertain.
Related questions and answers on StackExchange emphasize the formation processes, but they do not directly address the scaling: