1) Beautiful stone 2) Cut mineral 3) Decorative stone 4) Gemstone 5) Gemstone mineral 6) Jewel mineral 7) Jewel 8) Mineral jewel 9) Mineral gemstone 10) Pleonaste 11) Polished mineral 12) Polished jewel 13) Precious stone 14) Precious gemstone 15) Precious jewel 16) Prized stone 17) Prized mineral 18) Precious gem 1) Pleonaste 
==Composition== The mineral ceylonite has the chemical composition of (Mg, Fe2+) Al2O4, putting it into a group of minerals known as the spinels, or the oxide spinels. The oxide spinels have a formula of the model [A][B]2O4; where [A] is commonly Fe2+, Mg2+, or Mn2+, and [B] is Fe3+, Al3+, or Cr3+. ==Structure== Ceylonite has the structural formul...
[n] - a dark-colored spinel containing iron
pleonaste noun a dark-colored spinel containing iron