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Thortveitite

Year of discovery: 1911 (Ljoslandsknipan, Norway), 1962 (Japan)

Locality list: 3 localities of thortveitite

• Sc₂Si₂O₇
• (Sc,Y)₂Si₂O₇
• [Sc³⁺₂][Si₂O₇]^6-

• Class: Thortveitite group
• Class: Sorosilicate
• Insoluble in: HCl

• Sc => Y: Keiviite-(Y), Yttrialite-(Y)
• Sc => Yb: Keiviite-(Yb)

• Sc₂ => Ca₃: Rankinite, Kilchoanite

• Sc₂ => CaZr: Gittinsite

• Sc₂ => K₂Zr: Khibinskite
• Sc₂ => Na₂Zr: Parakeldyshite, Keldyshite

• Color: Grayish green, Black
• Streak: Gray
• Luster: Vitreous
• Diaphaneity: Translucent

• Cleavage: Distinct on {100} (1 plane)
• Hardness: 6-7
• Density: 3.5

• System: Monoclinic
• Group: 2/m, C2/m
• Lattice: a=6.7, b=8.6, c=4.7, β=102.2