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Plombièrite, Plombierite

Year of discovery: 1858 (Plombières-les-Bains, France), 1962 (Japan)

Locality list: 4 localities of plombièrite

• Ca₅Si₆O₁₆(OH)₂,7H₂O
• [Ca²⁺₅][(HSi₃O₉)₂]^10-,7H₂O

• Class: Tobermorite supergroup
• Class: Inosilicate (Single chain) - Hydrate
• Fluorescence: UV excitation (Yellow), Phosphorescence

• 7H₂O => 2H₂O (Tobermorite-9Å): Riversideite
• 7H₂O => 5H₂O (Tobermorite-11Å): Tobermorite
• 7H₂O => 4H₂O: Clinotobermorite

• Color: White, Reddish brown
• Streak: White
• Luster: Earthy
• Diaphaneity: Translucent

• Hardness: 2.0

• System: Monoclinic (2M), Orthorhombic (4O) (Order-Disorder polytype)
• Group: 2, B11b
• Lattice: a=6.7, b=7.4, c=28.0, β=123.3
• Group: mm2, F2dd
• Lattice: a=11.2, b=7.3, c=56.0

Synonym: Tobermorite-14Å