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Kilchoanite

Year of discovery: 1961 (Kilchoan, UK), 1973 (Japan)

Locality list: A locality of kilchoanite

• Ca₃Si₂O₇
• [Ca²⁺₃][Si₂O₇]^6-

• Class: Sorosilicate

• Polymorph: Rankinite (Monoclinic)

• Ca₂ => Zr: Gittinsite

• Ca₃ => Y₂: Keiviite-(Y), Yttrialite-(Y)
• Ca₃ => Yb₂: Keiviite-(Yb)
• Ca₃ => Sc₂: Thortveitite

• Ca₃ => K₂Zr: Khibinskite
• Ca₃ => Na₂Zr: Parakeldyshite, Keldyshite

• Color: Colorless
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: No
• Density: 3.0

• System: Orthorhombic
• Group: mm2, I2cm
• Lattice: a=11.4, b=5.1, c=22.0