Eudialyte is a rare cyclosilicate mineral belonging to the eudialyte group, with a complex chemical composition rich in sodium, calcium, iron, manganese, zirconium, and silicate. Its name comes from the Greek words meaning “easily decomposable,” referring to its solubility in acid.
- Formula: Na₁₅Ca₆(Fe,Mn)₃Zr₃Si(Si₂₅O₇₃)(O,OH,H₂O)₃(Cl,OH)₂
- Crystal system: Trigonal
- Hardness: 5–5.5 on Mohs scale
- Luster: Vitreous
- Colors: Deep magenta, red, pink, with black and green inclusions
- Transparency: Transparent to translucent