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Swinefordite

Year of discovery: 1973 (Foote Lithium Co. mine, USA), 2025 (Japan)

Locality list: A locality of swinefordite

• Ca_0.2(Li,Al,Mg,Fe)₃(Si,Al)₄O₁₀(OH,F)₂,nH₂O
• [(Ca²⁺)_0.2][(Li⁺,Al³⁺,Mg²⁺,Fe²⁺)₃][(OH,F)₂|((Si,Al)₂O₅)₂]^6-,nH₂O

• Class: Dioctahedral < Smectite group < Mica supergroup
• Class: Phyllosilicate - Hydroxide - Hydrate

• Color: White, Greenish yellow, dark greenish gray
• Streak: White
• Luster: Earthy
• Diaphaneity: Translucent

• Habit: Earthy

• Hardness: 1

• System: Monoclinic
• Group: 2/m, B2/m
• Lattice: a=5.2, b=9.0, c=13.0, β=90.0