a. A negatively charged ion, such as a hydroxide, chloride, or sulfate
ion; opposite of cation. Webster 3rd
b. An atomic particle with a negative charge; one attracted to the anode.
CF:cation
A measure of the ability of a clay to adsorb or exchange anions; usually
expressed in milliequivalents or anions per 100 g of dry clay.
ACSG, 2
A flotation reagent in which the reactive group is acid in character. In
these collectors the hydrocarbon group is in the anion. The most common
anionic collectors are fatty acids (carboxylic acids). They occur
naturally as complex mixtures in which the hydrocarbon chain is saturated
or unsaturated. Fuerstenau
Negative-ion electrical current.
A detergent in which the anion (negative ion) is the active part.
ASM, 1
A flotation process employing anionic collectors. Anionic collectors are
those in which the negative ion (anion) is the effective part. Opposite of
cationic flotation, which employs cationic, or positive, ion collectors.
a. An obsolete syn. for heterogranular.
b. Said of crystals with unequal dimensions, including those with
significant flattening, elongation, or both. Ant. isometric. CF:equant;
tabular.
c. See:heterogranular
d. Said of crystal structures with chemical bond strengths that are
directionally unequal; e.g., micas.
a. Having unsymmetrical parts; not isometric; applied to crystals with
three unequal axes. Webster 3rd
b. Of or relating to a rock of granular texture but having mineral
constituents of unequal size. Webster 3rd
c. A textural term applied to granular rocks in which the grains are of
different sizes. Obsolete. The term "seriate" expresses the same texture
when the crystals vary gradually or in a continuous series.
CF:isodiametric; isometric. Johannsen
Having physical properties that vary in different directions. Specif. in
optical crystallography showing double refraction. Characteristic of all
crystalline substances, including minerals, except those belonging in the
isometric system, which are isotropic. Opposite of isotropic.
Fay; AGI
A fabric in which there is preferred orientation of the minerals of which
the rock is composed.
a. The property of being anisotropic, or exhibiting properties (such as
velocity of light transmission, conductivity of heat or electricity, or
compressibility) with different values when measured along axes in
different directions. Webster 3rd
b. The condition of having different properties in different directions as
in geologic strata that transmit sound waves with different velocities in
the vertical and in the horizontal directions. AGI
c. Optically descriptive of crystalline materials having light velocities
and indices of refraction dependent upon the crystallographic direction of
the electric vector (vibration direction) during transmission or
reflection; it includes all nonisometric crystals. CF:uniaxial;
extinction; isotropy.
d. In geostatistics, the situation where a variogram exhibits a longer
range (i.e., better correlation) in one direction than in another.
A trigonal mineral, Ca(Fe,Mg,Mn)(CO3 )2 ; dolomite group;
forms series with dolomite and with kutnohorite; associated with iron
ores; commonly forms thin veins in some coal seams. CF:ferroan dolomite;
cleat spar. See also:pearl spar
A monoclinic mineral, 2[Ni3 (AsO4 )2 .8H2 O] ;
vivianite group with cobalt replacing nickel toward erythrite; occurs as
light-green soft coatings of fine striated crystals, or earthy; an
oxidation product of nickel and cobalt arsenides, the green crusts being a
distinctive guide to nickel ores. Formerly called nickel ocher.
CF:nickel bloom
A wire rope made from wires that have been softened by annealing.
Zern
a. Heating to and holding at a suitable temperature and then cooling at a
suitable rate for such purposes as reducing hardness; improving
machinability; facilitating cold working; producing a desired
microstructure; or obtaining desired mechanical, physical, or other
properties. When applied to ferrous alloys, the term "annealing", without
qualification, implies full annealing. When applied to nonferrous alloys,
annealing implies a heat treatment designed to soften a cold-worked
structure by recrystallization or subsequent grain growth or to soften an
age-hardened alloy by causing a nearly complete precipitation of the
second phase in relatively coarse form. ASM, 1
b. The variation of the cooling rate at different temperatures of
porcelain, glass, and other ceramic ware containing large quantities of
vitreous material to prevent defects such as dunting, crazing, cracking,
crystallization, etc.
c. The process by which glass and certain metals are heated and then
slowly cooled to make them more tenacious and less brittle. Important in
connection with the manufacture of steel castings, forgings, etc.
Fay
d. The process of heating metal shapes to a red heat or above, prior to
cleaning.
The hue taken by steel in annealing. Standard, 2
A oven for heating and gradually cooling metals or glass to render them
less brittle. Also called annealing furnace. Standard, 2; Fay
A black mixture of samarskite with parallel overgrowths of columbite. Also
spelled aanerodite.
A monoclinic mineral, KFe3 AlSi3 O10 (OH,F)2 ;
mica group; trioctahedral.
A variety of tennantite with arsenic partly replaced by bismuth and
antimony.
Same as assessment work, on mining claims.