ankerite


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Related to ankerite: clinochlore, siderite

ankerite

[′aŋ·kə‚rīt]
(mineralogy)
Ca(Fe,Mg,Mn)(CO3)2 A white, red, or gray iron-rich carbonate mineral associated with iron ores and found in thin veins in coal seams; specific gravity is 2.95-3.1. Also known as cleat spar.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Ankerite, stained wathlet blue under the thin section, is micro- to coarse-crystalline (<10~100[micro]m) and generally occurs as overgrowths around dolomite grains, Fe-calcite, and dolomite cement filling intergranular and dissolution pores (Figure7b).
The volume changes of [H.sub.2]S[O.sub.4] and [H.sub.3]P[O.sub.4] contaminated kaolin clay are due to (a) anion adsorption, (b) formation of flocculant, face-to-edge structures, and (c) dissolution of calcite and ankerite minerals and formation of sulphate and phosphate minerals.
Additionally, the peaks at 1091 [cm.sup.-1] are in accordance with the weak peak of the [V.sub.4]-zone at 722 [cm.sup.-1] for carbonate ions, which are similar to peaks of ankerite. In the spectrograms, two weak peaks at 840 [cm.sup.-1] and 1186 [cm.sup.-1] could have originated from the metamorphic reaction between silica and carbonate, which exhibit symmetric and antisymmetric stretching vibration peaks for SiO-R, and they are too weak to accurately estimate.
The Company is carrying out ongoing exploration programs, designed to build the resource base and to test the growth potential and determine the economics on its four key property assets: Buffalo Ankerite (100% interest), Fuller (100% interest), Davidson Tisdale (68.5% interest) and Paymaster (60% interest).
Replacement bodies in mafic igneous rocks consist of semi-massive to massive pyrite in a gangue of ankerite and sericite, transected by veins of quartz and dolomite.
Such calculation is possible only for non-ferroan dolomites not bearing ankerite (< 2 mol% FeCO3 by Goldsmith & Graf 1958).
Pour ce faire, nous avons retenu, a titre indicatif, les grevistes dont le nom de famille commencait par B, etant donne que ces fiches sont deja disponibles pour quatre entreprises minieres du Nord, soit la Sigma Gold Mines de Val-D'or (pour lesquelles nous avons les fiches de 1934 a 1945), la Buffalo Ankerite de Timmins (1926-1940), la Beattie Gold Mines de Duparquet (1939-1940) et l'Inco (1912-1939(52)).
Limestones are dominated by the carbonate minerals calcite and aragonite, which represent different crystal forms of calcium carbonate, along with dolomite while less common minerals include ankerite, magnesite, and siderite (Fookes and Hawkins, 1988).
Montmorillonite Illite Quartz Cristobalite Albite Shale 1.66 3.60 50.23 4.75 17.60 Calcite Muscovite Pyrite Annite Ankerite Shale 2.60 5.71 5.80 3.83 4.21 TABLE 2: Mechanical properties of shale samples under uniaxial compression test.