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Titantaramellite

Year of discovery: 1977 (Canda, Mexico, USA)

Locality list:

• Ba₄(Ti,Fe³⁺,Mg)₄B₂Si₈O₂₇(O,OH)₂Cl_x
• Ba₄(Ti,Fe³⁺,Fe²⁺,Mg)₄B₂Si₈O₂₇O₂Cl_x
• [Ba²⁺₄][Ti³⁺,Fe³⁺,Fe²⁺,Mg²⁺][Cl_x|O₂|B₂Si₈O₂₇]^20-

• Class: Cyclo-Borosilicate - Oxide - Chloride

• Ti => Fe: Taramellite (Series)
• Ti => V: Nagashimalite

• Color: Dark brown, Black
• Luster: Vitreous, Greasy
• Diaphaneity: Transparent, Translucent, Opaque

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 6
• Density: 4.1

• System: Orthorhombic
• Group: mmm, Pnmm
• Lattice: a=12.2, b=14.0, c=7.1