And this week we deal with the master biocrystal, cerulite.
This is probably the most difficult to use of all the biocrystals, if only because it only functions in conjunction with the others.
Each of the biocrystal types has a unique shape, and cerulite in particular would look like a weave or a latice, not unlike how DNA might form, more or less (though cerulite certainly wouldn’t form the same shape as DNA). I imagine cerulite latices would form into one of a few number of knots (probably two or, more likely, four), that would be the foundation for a kind of programming language. The arrangement of these knots would then determine the function of that particular piece of cerulite.
Aside from these knots, cerulite would also grow tendrils to attach to other biocrystals, which the knots would then regulate/control.
In particularly concentrated amounts, cerulite can give rise to sentient beings, possibly even sapient beings. Probably not naturally, though. But I imagine creating sentient or sapient beings out of cerulite would be continual project for any civilization that encounters cerulite, much in the way our civilization reaches for A.I. (I think the two would be on some level more or less synonymous or something.)
The primary use for cerulite would be for moderating growth, either promoting it or limiting it for other biocrystals. It would also be the center of some lightly sentient machines, of, for example, self-moving carts or wagons, and, given significant research and invention, other machines.
Thoughts? Feel free to comment with any suggestions, questions, or ideas you might have.