Assertion: calcium carbonate's form | /r/HasProperty | nontoroidal
Facets:
Source sentences:
text: As additional controls, when enantiomers of neutral and basic chiral amino acids such as Ala and Lys (respectively) were used, or the simplest achiral amino acid Gly was added, the vaterite forms were symmetrically hexagonal, nontoroidal and achiral (Fig. 4).