Zircon
WordNet
noun
(1) A common mineral occurring in small crystals; chief source of zirconium; used as a refractory when opaque and as a gem when transparent
WiktionaryText
Etymology
From Zirkon or zircone < (zarqūn) ‘cinnabar, bright red’.
Noun
- A mineral occurring in tetragonal crystals, usually of a brown or grey colour and consisting of silica and zirconia.
- A crystal of zircon, sometimes used as a false gemstone.