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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:

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    $\begingroup$ Not an answer but I have observed columnar basalt in many locations, it seems to me that the larger columns are on thicker and deeper sections on the original source flows. I would expect that these areas cool slower. It would not surprise me if the composition of the flows also have an influence. $\endgroup$ – Friddy May 15 at 23:55

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