n.
A white, gray, or red iron-rich dolomitic or carbonate mineral, Ca(Fe,Mg,Mn)(CO3)2.
[After Matthias Joseph Anker (1771-1843), Austrian mineralogist.]
ankerite
Dictionary:
an·ker·ite (ăng'kə-rīt') 
|
n.
A white, gray, or red iron-rich dolomitic or carbonate mineral, Ca(Fe,Mg,Mn)(CO3)2.
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| Sci-Tech Encyclopedia: Ankerite |
The carbonate mineral Ca(Fe,Mg)(CO3)2, also commonly containing some manganese. The mineral has hexagonal (rhombohedral) symmetry and has the cation-ordered structure of dolomite. The name is applied only to those species in which at least 20% of the magnesium positions are occupied by iron or manganese; species containing less iron are termed ferroan dolomites. The pure compound, CaFe(CO3)2, has never been found in nature and has never been synthesized as an ordered compound. See also Dolomite.
Ankerite is commonly white to light brown, its specific gravity is about 3, and its hardness is about 4 on Mohs scale. See also Carbonate minerals.
| Wikipedia: Ankerite |
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.
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 colour is white, grey or reddish to yellowish brown.
Ankerite occurs with siderite in deposits of iron-ore. 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.
Ankerite can result from hydrothermal or direct groundwater precipitation. It can also be the result of metamorphic recrystallization of iron-rich sedimentary rocks. It is often found as a gangue mineral associated with gold and a variety of sulfide minerals in ore deposits.
It was first recognized as a distinct species by W. von Haidinger in 1825, and named by him after Matthias Joseph Anker (1771-1843) of Styria, an Austrian mineralogist.
See also
References
This article incorporates text from the Encyclopædia Britannica, Eleventh Edition, a publication now in the public domain.
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 | Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved. Read more |
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| Sci-Tech Encyclopedia. McGraw-Hill Encyclopedia of Science and Technology. Copyright © 2005 by The McGraw-Hill Companies, Inc. All rights reserved. Read more |
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Mentioned in
- rauhaugite (petrology)
- pearl spar (mineralogy)
- brown spar (geology)
- ferroan dolomite (mineralogy)
- ferrodolomite (mineralogy)
- brown
- Carbonate minerals (mineralogy and petrology)
- Carbonatite (mineralogy and petrology)
- Kutnohorite
- Ferrotantalite
- Tephroite
- Hauerite
- Jeffersonite
- Knebelite
