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Rankinite [abbr. Rnk ]

Year of discovery: 1942 (Scawt Hill, UK), 1969 (Japan)

Locality list: 2 localities of rankinite

• Ca₃Si₂O₇
• [Ca²⁺₃][Si₂O₇]^6-

• Class: Sorosilicate

• Polymorph: Kilchoanite (Orthorhombic)

• 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, White
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: No
• Hardness: 5.5
• Density: 3.0

• System: Monoclinic
• Group: 2/m, P2₁/a
• Lattice: a=10.6, b=8.9, c=7.9, β=119.6