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Dalyite

Year of discovery: 1959 (Green Mountain, Ascension and Tristan da Cunha), 2022 (Japan)

Locality list: A locality of dalyite

• K₂ZrSi₆O₁₅
• K₂(Zr,Ti)Si₆O₁₅
• [(K⁺)₂][Zr⁴⁺][(Si₂O₅)₃]^6-

• Class: Inosilicate (Double chain)

• K₂ => LiNa: Zektzerite

• Zr => Ti: Davanite

• Color: Colorless, Brown
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent, Translucent

• Hardness: 7.5

• System: Triclinic
• Group: -1, P(-1)
• Lattice: a=7.5, b=7.7, c=7.0, α:=106.0, β=113.5, γ=99.5