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Ankerite is a calcium, iron, magnesium, manganese carbonate mineral of the group of rhombohedral carbonates with formula: Ca(Fe,Mg,Mn)(CO3)2. In composition it is closely related to dolomite, but differs from this in having magnesium replaced by varying amounts of iron(II) and manganese. It forms a series with dolomite and kutnohorite.[2]

The crystallographic and physical characters resemble those of dolomite and siderite. The angle between the perfect rhombohedral cleavages is 73° 48', the hardness is 3.5 to 4, and the specific gravity is 2.9 to 3.1. The color is white, grey or reddish to yellowish brown.[4]

Ankerite occurs with siderite in metamorphosed ironstones and sedimentary banded iron formations. It also occurs in carbonatites. In sediments it occurs as authigenic, diagenetic minerals and as a product of hydrothermal deposition.[1] It is one of the minerals of the dolomite-siderite series, to which the terms brown-spar, pearl-spar and bitter-spar have been historically loosely applied.[4]

It was first recognized as a distinct species by W. von Haidinger in 1825, and named for Matthias Joseph Anker (1771–1843) of Styria, an Austrian mineralogist.[2]

It has been found in Western Tasmania, in mines in Dundas, Tasmania.

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See also

References

  1. ^ a b Handbook of Mineralogy
  2. ^ a b c Ankerite on Mindat.org
  3. ^ Ankerite on Webmineral
  4. ^ a b  One or more of the preceding sentences incorporates text from a publication now in the public domainSpencer, Leonard James (1911). "Ankerite". In Chisholm, Hugh. Encyclopædia Britannica. 2 (11th ed.). Cambridge University Press. p. 58. 

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