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Fer`ro*cal"cite (?), n. [Ferro-
+ calcite.] Limestone containing a large percentage of
iron carbonate, and hence turning brown on exposure.

Fer`ro*cy"a*nate (?), n. [Ferro-
+ cyanate: cf. F. ferrocyanate.] (Chem.) A
salt of ferrocyanic acid; a ferrocyanide.

Fer`ro*cy*an"ic (?), a. [Ferro-
+ cyanic: cf. F. ferrocyanique.] (Chem.)
Pertaining to, derived from, or designating, a
ferrocyanide.

ferrocyanic acid (Chem.), a white
crystalline substance, H₄(CN)₆Fe, of strong
acid properties, obtained from potassium ferrocyanide, and regarded
as the type of the ferrocyanides; -- called also hydro-ferrocyanic
acid, hydrogen ferrocyanide. etc.

Fer`ro*cy"a*nide (? or ?; 104), n.
[Ferro- + cyanide.] (Chem.) One of a series
of complex double cyanides of ferrous iron and some other
base.

Potassium ferrocyanide (Chem.),
yellow prussiate of potash; a tough, yellow, crystalline salt,
K₄(CN)₆Fe, the starting point in the
manufacture of almost all cyanogen compounds, and the basis of the
ferric ferrocyanate, prussian blue.


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