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Cymrite

Year of discovery: 1949 (Benalt mine, UK), 1970 (Japan)

Locality list: 15 localities of cymrite

• BaAl₂Si₂O₈,H₂O
• Ba(Si,Al)₄(O,OH)₈,H₂O
• [Ba²⁺][Al₂Si₂O₈]^2-,H₂O

• Class: Phyllo-Aluminosilicate - Hydrate

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

• Cleavage: Good on {001} and {101} (2 planes)
• Hardness: 2-3
• Density: 3.4

• System: Monoclinic, Pseudohexagonal
• Group: 2, P2₁
• Lattice: a=5.3, b=36.6, c=7.7, β=90.0