Gem-name guide / Gem variety

Sillimanite Cat’s-eye

Al₂SiO₅

Sillimanite Cat’s-eye is indexed as a gem variety in this gem-name directory. The CIBJO nomenclature table associates this name with Sillimanite. Gem names may describe appearance or a material family; a name alone does not identify treatments, origin or quality.

Material or mineral family

Sillimanite

Name classification

Gem variety

Explore the mineral record

Names describe materials, not the authenticity, treatment, provenance or quality of a particular specimen. Physical properties vary for mixed materials; values absent from this guide have not been estimated.