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Boltwoodite

Year of discovery: 1956 (Pick's Delta mine, USA), 1961 (Japan)

Locality list: 2 localities of boltwoodite

• K(UO₂)(HSiO₄),0.5H₂O
• (K,Na)(UO₂)(HSiO₄),0.5H₂O
• [K⁺][UO₂]²⁺[HSiO₄]^3-,0.5H₂O

• Class: Uranyl - Nesosilicate
• Fluorescence: UV excitation (Green)
• Radioactive: Very strong

• Color: Yellow
• Streak: White
• Luster: Pearly
• Diaphaneity: Translucent

• Cleavage: Perfect on {010} (1 planes), Imperfect on {001} (1 plane)
• Hardness: 3.5-4
• Density: 4.7

• System: Monoclinic
• Group: 2, P2₁
• Lattice: a=7.1, b=7.1, c=6.6, β=105.5