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Ankerite [abbr. Ank ]

Year of discovery: 1825 (World), 1905 (Japan)

Locality list: 51 localities of ankerite

• CaFe(CO₃)₂
• Ca(Fe²⁺,Mg,Mn²⁺)(CO₃)₂
• [Ca²⁺][Fe²⁺][(CO₃)₂]^4-

• Class: Dolomite group
• Class: Carbonate
• Soluble in: HCl

• Ca => Fe: Siderite

• Fe => Mg: dolomite (Series)
• Fe => Mn: kutnohorite (Series)
• Fe => Zn: Minrecordite
• Fe => Ca: Calcite, Aragonite, Vaterite

• Color: Pale brown
• Tarnish: Dark brown (by weathering)
• Streak: White
• Luster: Vitreous
• Diaphaneity: Translucent

• Habit: Rhombohedral, Thick platy

• Cleavage: Perfect on {1011] (rhombohedral 3 planes)
• Hardness: 3.5-4
• Density: 3.1

• System: Trigonal
• Group: (-3), R(-3)
• Lattice: a=4.8, c=16.2