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Yttrialite-(Y)

Year of discovery: 1889 (Baringer Hill, USA), 1938 (Japan)

Locality list: 9 localities of yttrialite-(Y)

• Y₂Si₂O₇
• (Y,Th)₂Si₂O₇
• [Y³⁺₂][Si₂O₇]^6-

• Class: Sorosilicate
• Soluble in: HCl
• Radioactive: Strong

• Polymorph: Keiviite-(Y) (Monoclinic)

• Y => Yb: Keiviite-(Yb)
• Y => Sc: Thortveitite

• Y₂ => Ca₃: Rankinite, Kilchoanite

• Y₂ => CaZr: Gittinsite

• Y₂ => K₂Zr: Khibinskite
• Y₂ => Na₂Zr: Parakeldyshite, Keldyshite

• Color: Grayish green, Brown, Black
• Streak: Pale brown
• Luster: Greasy
• Diaphaneity: Translucent-Opaque

• Habit: Thin platy

• Cleavage: No
• Hardness: 5.5
• Density: 4.6

• System: Monoclinic
• Group: 2/m, P2₁/m
• Lattice: a=7.3, b=8.1, c=5.0, β=108.5