a. A hexagonal mineral, 2[NiAs] ; commonly contains antimony, cobalt,
iron, and sulfur; one of the chief ores of nickel. Formerly called:
niccolite; nickelite; arsenical nickel; copper nickel; kupfernickel.
b. The mineral group breithauptite, freboldite, imgreite, langisite,
nickeline, sederholmite, sobolevskite, stempflite, and sudburyite.
a. A mineral, NiFe, containing about 76% nickel and found in meteorites.
Isometric. Dana, 4
b. The native alloy of nickel with iron in meteorites.
See also:kamacite; taenite.
A former name for nickeline. See also:nickeline
An early name for annabergite. Fay
a. NiO; green, becoming yellow. Found in nature as the mineral bunsenite.
Soluble in acids and in ammonium hydroxide; insoluble in water; sp gr, 6.6
to 6.8. NiO absorbs oxygen at 400 degrees C forming Ni2 O3
which is reduced to NiO at 600 degrees C. Used in nickel salts and in
porcelain painting. CCD, 2
b. Isometric; green to black; molecular weight, 74.71; melting point,
1,990 degrees C; sp gr, 6.67. Used for painting on china.
Bennett; Handbook of Chemistry and Physics, 2
Comprises the two nickel oxides, nickelous oxide (NiO) and nickelic oxide
(Ni2 O3 ) , which are used extensively as colorants in
glasses, glazes, and enamels. The use of nickel oxide in enamels is
generally in the ground coat, in which it is used with cobalt and
manganese. It is also used in cover coat enamels to give what is known as
a daylight shade for reflector units. Nickelic oxide imparts a color to
glass which is dependent upon the character of the alkali present.
Nickelous oxide is used in glazes to produce blues, greens, browns, and
yellows. Nickel oxide is also one of the principal components of certain
type of ferrites, e.g, the nickel-zinc ferrite.
See also:nickelous oxide
The deposition of a coating of metallic nickel by electrolysis.
Nelson
See:millerite
An isometric mineral, NiAs2-3 ; isostructural with skutterudite;
tin white; in intermediate-temperature hydrothermal veins, particularly in
association with Co, Ni, Fe arsenides, sulfarsenides, and native silver.
Syn:white nickel
See:morenosite
a. The cutting of a vertical groove in a seam to liberate coal after it
has been holed or undercut. Nelson
b. Used in wire-rope terminology to describe the internal crosscutting of
wires within a rope. Sinclair, 5
c. The chipping of coal along the rib of an entry or room, which is
usually the first indication of a squeeze. Fay
d. A vertical cutting or shearing one side of a face of coal. Also called
cut; cutting. Fay
Newc. The small coal produced in making a nicking. See also:bug dust;
makings. Fay
a. Nicol prism.
b. Any apparatus that produces polarized light, e.g., Nicol prism or
Polaroid. See also:polar; polarizer.
A former name for nickeline. See also:nickeline
A special prism for producing polarized light, made from two pieces of
Iceland spar (calcite) cemented together with Canada balsam. Light
entering the prism is split into two polarized rays; of these, the
ordinary ray is totally reflected at the balsam layer while the
extraordinary ray is able to pass through the prism. In a petrological
microscope two Nicol prisms are incorporated.
See also:polarizing prism
a. A classification of igneous rocks on the basis of their chemical
composition, similar in some respects to the norm system. It was proposed
in 1920 by the Swiss mineralogist Paul Niggli. AGI
b. A classification of ore deposits, the major groups being plutonic, or
intrusive, and volcanic, or extrusive. It was proposed in 1929.
AGI
See:evening emerald
Corn. Miners who work underground during the night. The night shift.
Fay
The coal miners' shift from about 12:00 p.m. to 8:00 a.m. It may be a
coal-winning shift, but in general it is a preparation or maintenance
shift. Nelson
A product of the coalification of fix bitumens rich in carbon; insoluble
or only slightly soluble in organic solvents. It is subdivided into
polynigritite, humonigritite, exinonigritite, and keronigritite.
Tomkeieff
Nothing; zero. Often used in reporting gold and silver assays.
Webster 3rd; Fay