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Geikielite [abbr. Gk ]

Year of discovery: 1892 (Rakwana, Sri Lanka), 1958 (Japan)

Locality list: 7 localities of geikielite

• MgTiO₃
• [Mg²⁺][TiO₃]^2-

• Class: Ilmenite group
• Class: Titanate
• Soluble in: HCl
• Magnetism: Paramagnetic

• Mg => Ba: Barioperovskite
• Mg => Ce: Loparite-(Ce)
• Mg => Sr: Tausonite
• Mg => Ca: Perovskite
• Mg => Zn: Ecandrewsite
• Mg => Mn: Pyrophanite
• Mg => Fe: Ilmenite (Series)

• Ti => Si: Akimotoite

• Color: Black, Dark brown
• Streak: Purplish brown
• Luster: Sub-Metallic
• Diaphaneity: Translucent-Opaque

• Cleavage: Distinct on {1011} (3 planes)
• Hardness: 5-6
• Density: 4.0

• System: Trigonal
• Group: 3, R3
• Lattice: a=5.1, c=13.9