I did FESEM of samples prepared from mixtures of phospholipids PA, PS, PC, PE and PI, but I don't understand whether these are cochleates or lipid tubules?
Well, it would be easier to answer your question if a picture and some details of the sample preparation are provided.
Anyways, cochleates, which typically form in the presence of Ca2+ ions (e.g. DOPS and Ca23, etc), are rigid structures, usually look like a roll in cross section, also, depending on the conditions, these rolls can aggregate. The point is that they are densely packed and rigid structures.
Lipid tubules usually do not form rolls but cylinders.
To say more, definitely would need more information.