Assertion: calcite's cleavage | /r/HasProperty | good
Facets:
Source sentences:
text: Minerals with many cleavages might not break equally well in all of the directions; for example, calcite has good cleavage in three directions, but gypsum has perfect cleavage in one direction, and poor cleavage in two other directions.
text: There are more than one cleavage planes for it, there is a perfect cleavage on {100}, good cleavages on {001}, and {102}, and an imperfect cleavage on {101}. It is common for wollastonite to have a twin axis , a composition plane (100), and rarely to have a twin axis .