[ Top ] [ Japanese ]

Tobermorite (Photo)

Year of discovery: 1880 (Tobermory, UK), 1962 (Japan)

Locality list: 22 localities of tobermorite

• Ca₅Si₆O₁₆(OH)₂,5H₂O
• Ca₅Si₆(O,OH)₁₈,5H₂O
• [Ca²⁺₅][(HSi₃O₉)₂]^10-,5H₂O

• Class: Tobermorite group < Tobermorite supergroup
• Class: Inosilicate (Single chain) - Hydrate
• Fluorescence: UV excitation (Pale yellow)

• 5H₂O => 2H₂O (Tobermorite-9Å): Riversideite
• 5H₂O => 4H₂O: Clinotobermorite
• 5H₂O => 7H₂O (Tobermorite-14Å): Plombièrite (Plombierite)

• Color: White, Pale brown
• Streak: White
• Luster: Silky
• Diaphaneity: Translucent

• Aggregate: Ceramic

• Cleavage: Perfect on {001} (1 plane), Imperfect on {100} (1 plane)
• Hardness: 2.5
• Density: 2.4

• System: Monoclinic (2M), Orthorhombic (4O) (Order-Disorder polytype)
• Group: 2, B11m
• Lattice: a=6.7, b=7.4, c=22.7, β=123.2
• Group: mm2, F2dd
• Lattice: a=11.2, b=7.4, c=22.9

Synonym: Tobermorite-11Å