Currently setting up my factory on Circa. However, I notice that the bitumen tar processing produces Bone Fragments as a byproduct... and those seem to mainly be used to turn into Calcite, or to create the Microculture Vats. That said, I know I won't be using enough of the Microculture Vats to burn through all of the Bone. What would I be able to use the Calcite for, if I'm doing Circa before Vulcanus (and thus don't have the usual Calcite recipes unlocked)? Or is there another Bone Fragments recipe that I'm missing somewhere that I should be seeing? (If it's expected that you do Vulcanus first in order to access other ways of using Calcite, it might be worth making the Circa planet research require Metallurgic Science to ensure that.)
(As a note, I'm using the Stellar Horizons modpack, so I've got quite a few other modded planets as well - if there's something that's overlapping with an expected recipe that uses Calcite or is otherwise preventing me from gaining access to a means of voiding it, feel free to let me know.)