ANKERITE

This article appears in Volume V02, Page 58 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: ANC-APO

ANKERITE , a member of the

mineral

MINERAL

group of rhombohedral carbonates. In composition it is closely related to dolomite, but differs from this in having

magnesia

MAGNESIA

replaced by varying amounts of ferrous and manganous oxides, the general

formula

being Ca(Mg,Fe,Mn) (COs)2. Normal ankerite is Cat MgFe(COa)4. The crystallographic and

physical

PHYSICAL

characters resemble those of dolomite and chalybite. The

angle

ANGLE (from the Lat. angulus, a corner, a diminutive, of which the primitive form,
angus
- ANGUS, EARLS OF
, does not occur in Latin; cognate are the Lat. angere, to compress into a bend or to strangle, and the Gr. ayKOS, a bend; both connected with the Aryan root ank-, to

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 colour is

white

, grey or reddish.
Ankerite occurs with chalybite in deposits of iron-ore. It is one of the minerals of the dolomite-chalybite

series

SERIES (a Latin word from serere, to join)

, to which the terms brown-spar, pearl-spar and

bitter

BITTER, KARL THEODORE FRANCIS (1867– )

-spar are loosely applied. It was first recognized as a distinct species by W. von Haidinger in 1825, and named by him after M. J. Anker of Styria. (L J. S)

End of Article: ANKERITE

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