I have not contributed anything towards calcite. So I have the least right
to voice any opinion...
But since you brought in chemistry angle, you could also consider sthg like
stalactites or stalagmites (sorry if I spelt that wrong) - which are
beautiful formations inside natural caves... They are beautiful structures
(Google for the images.... they R stunning)... I think it resonates well
with what people would imagine when some1 says calcite to them.
But yeah, it really does not relate anything related to what this project
is all about..
