Kentrolite

Example:The samples of kentrolite provided excellent specimens for studying the crystal structure of rare minerals.

Definition:A solid substance in which the atoms, molecules, or ions are arranged in a regular, repeating three-dimensional pattern.

Example:Though kentrolite is not typically used in jewelry, it is often a significant component in geological studies.

Definition:A precious or semiprecious stone that is cut and polished and used in jewelry.