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Ankerite

It was named after Mathias J. Anker (1771-1843), an Austrian mineralogist. It is white or yellowish. They usually form granular aggregates or well-limited arch crystals. It occurs on hydrothermal veins, on iron ore deposits (siderite) and in sedimentary rocks. More info

It was named after Mathias J. Anker (1771-1843), an Austrian mineralogist. It is white or yellowish. They usually form granular aggregates or well-limited arch crystals. It occurs on hydrothermal veins, on iron ore deposits (siderite) and in sedimentary rocks.

  • Chemical Formula: Ca(Fe++,Mg,Mn)(CO3)2
  • Molecular Weight: 206.39 gm
  • Environment: Common in ore-bearing rocks as a rock forming mineral (gangue). High Fe species are found in iron ores.
  • IMA Status: Valid Species (Pre-IMA) 1825
  • Locality: Styrian Erzberg, Eisenerz, Styria, Austria
  • Synonym: Brown Spar

Composition:

  • Calcium: 19.42 %  Ca, 27.17 % CaO
  • Magnesium: 3.53 %  Mg, 5.86 % MgO
  • Manganese: 2.66 %  Mn, 3.44 % MnO
  • Iron: 16.24 %  Fe, 20.89 % FeO
  • Carbon: 1.64 %  C, 42.65 % CO2
  • Oxygen: 46.51 %  O

Physical Properties:

  • Cleavage: {1011} Perfect, {1011} Perfect, {1011} Perfect
  • Color: Brown, Brownish yellow, Gray, Gray brown, White.
  • Density: 3 - 3.1, Average = 3.05
  • Diaphaneity: Translucent to subtranslucent
  • Fracture: Sub Conchoidal - Fractures developed in brittle materials characterized by semi-curving surfaces.
  • Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
  • Habit: Granular - Generally occurs as anhedral to subhedral crystals in matrix.
  • Habit: Massive - Uniformly indistinguishable crystals forming large masses.
  • Hardness: 3.5-4 - Copper Penny-Fluorite
  • Luminescence: Non-fluorescent.
  • Luster: Vitreous (Glassy)
  • Streak: white
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