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Sekaninaite

Year of discovery: 1975 (Dolní Bory, Czech), 1931 (Japan)

Locality list: 23 localities of sekaninaite

• Fe₂Al₄Si₅O₁₈
• (Fe,Mg)₂Al₄Si₅O₁₈
• [Fe²⁺₂][Al₄Si₅O₁₈]^4-

• Class: Cordierite group
• Class: Cyclo-Aluminosilicate (Single ring)

• Polymorph: Ferroindialite (High temperature, Hexagonal)

• Fe => Mg: Cordierite (Series), Indialite

• Color: Grayish blue, Bluish purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent-Translucent

• Cleavage: Perfect on {100} (1 plane)
• Hardness: 7.5
• Density: 2.8

• System: Orthorhombic
• Group: mmm, Cccm
• Lattice: a=17.2, b=9.8, c=9.3