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Weeksite

Year of discovery: 1960 (Topaz Mountain, USA), 1962 (Japan)

Locality list: 2 localities of weeksite

• K₂(UO₂)₂Si₅O₁₃,H₂O
• (K,Ba)₂(UO₂)₂Si₅O₁₃,H₂O
• [K⁺₂][(UO₂)²⁺₂][Si₅O₁₃]^6-,H₂O

• Class: Weeksite group
• Class: Uranyl - Nesosilicate - Hydrate
• Radioactive: Very strong

• K₂ => Ca: Metahaiweeite

• Color: Yellow
• Streak: Yellow
• Luster: Waxy
• Diaphaneity: Transparent-Translucent

• Cleavage: Distinct
• Hardness: 1-2
• Density: 4.1

• System: Monoclinic
• Group: C2/m
• Lattice (2012): a=14.2, b=14.2, c=9.6, β=111.6