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ANKERITE

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Originally appearing in Volume V02, Page 58 of the 1911 Encyclopedia Britannica.
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ANKERITE , a member of the See also:

mineral See also:group of See also:rhombohedral See also:carbonates. In See also:composition it is closely related to See also:dolomite, but differs from this in having See also:magnesia replaced by varying amounts of ferrous and manganous oxides, the See also:general See also:formula being Ca(Mg,Fe,Mn) (See also:COs)2. Normal ankerite is See also:Cat MgFe(COa)4. The crystallographic and See also:physical characters resemble those of dolomite and See also:chalybite. The See also:angle between the perfect rhombohedral cleavages is 730 48', the hardness 31 to 4, and the specific gravity 2.9 to 3.1; but these will vary slightly with the chemical composition. The See also:colour is See also:white, See also:grey or reddish. Ankerite occurs with chalybite in deposits of See also:iron-ore. It is one of the minerals of the dolomite-chalybite See also:series, to which the terms See also:brown-spar, See also:pearl-spar and See also:bitter-spar are loosely applied. It was first recognized as a distinct See also:species by W. von See also:Haidinger in 1825, and named by him after M. J. Anker of See also:Styria. (L J.

End of Article: ANKERITE

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