Assertion: calcite's crystal | /r/HasProperty | small
Facets:
value: unfortunately
type: DEGREE
Source sentences:
text: These crystals are so small that they can not be seen by the naked eye.
text: These veins and crystals can be so tiny that they are not visible to the unaided eye.
text: The crystals are so small that no one has been able to test the limits of their hardness
text: Unfortunately, the crystals are so small that no one has been able to test the limits of their hardness, nor compare them with the artificial ultra-hard diamonds lonsdaleite and boron nitride.