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Milarite

Year of discovery: 1870 (Giuv Valley, Switzerland), 1994 (Japan)

Locality list: 4 localities of milarite

• K₂Ca₄Al₂Be₄Si₂₄O₆₀,H₂O
• [K⁺₂][Ca²⁺₄][Al³⁺₂][Be²⁺₄][(Si₂O₅)₁₂]^24-,H₂O

• Class: Milarite group
• Class: Cyclosilicate (Double ring) - Hydrate
• Insoluble in: HCl
• Fluorescence: Short UV excitation (Bluish white)
• Radioactive: Very weak

• Color: Colorless, Pale yellow
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Imperfect on {0001} and {1120} (4 plane)
• Hardness: 6
• Density: 2.5

• System: Hexagonal
• Group: 6/mmm, P6/mcc
• Lattice: a=10.4, c=13.8