rhombohedral
/ˌrɑmboʊˈhidrəl/
adjective
- Relating to or having the shape of a rhombohedron; describing a crystal system with three equal axes that are not at right angles.
- Quartz has a rhombohedral crystal structure.
- Scientists studied the rhombohedral symmetry of the mineral sample.
- The rhombohedral shape of the gem made it look unique.