| Webster's Online Dictionary |
| Expressions | Definition | ||
| Hopper crystal | A hopper crystal is a form of crystal, defined by its "hoppered" shape. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
| Expressions | Domain | Definition | |
| Hopper crystal | Mining | A crystal with edges grown beyond face centers. Cf: skeletal crystal. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||