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Ferroindialite

Year of discovery: 2013 (Caspar quarry, Germany), 2015 (Japan)

Locality list: 2 localities of ferroindialite

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

• Class: Cyclo-Aluminosilicate (Single ring)

• Polymorph: Sekaninaite (Low temperature, Orthorhombic)

• Fe => Mg: Indialite, Cordierite

• Color: Brownish purple, Pale purple
• Streak: White
• Luster: Vitreous
• Diaphaneity: Transparent

• Cleavage: No
• Hardness: 7-7.5
• Density: 2.5

• System: Hexagonal
• Group: 6/mmm, P6/mcc
• Lattice: a=9.9, c=9.3