A monoclinic mineral, CaLiAl2 (AlBeSi2 O10 )(OH) (sub
2) ; mica group; perfect basal cleavage.
a. Having a valence of 2. Webster 3rd
b. Having two valences; e.g., cobalt has two forms, with valences of 2 and
3, respectively. Handbook of Chemistry and Physics, 2
A red variety of beryl; in the Wah Wah and Topaz Mountains of Utah.
An isometric mineral, (Mn,Fe)2 O3 ; forms black cubes.
Formerly called partridgeite and sitaparite.
An old term for an alkali soil whose sodium tends to disperse organic
matter and give a black color. CF:white alkali
A name given to jet that is found with amber. It becomes faintly electric
when rubbed. See also:jet; stantienite.
See:melanite
a. Any of various dark-colored products obtained in industrial processes.
Webster 3rd
b. A black mass containing chiefly soda in the form of sodium carbonate
and usually also sodium sulfide with some carbon, and produced esp. for
recovery of its soda content by concentrating and burning black liquor in
rotary furnaces. Webster 3rd
a. A dark, earthy variety of the mineral siderite, occurring mixed with
clay, sand, and considerable carbonaceous matter, and frequently
associated with coal. Syn:blackband ore
b. A thin layer (up to 10 cm in thickness) of blackband interbedded with
clays or shales in blackband ironstone. AGI
c. See:blackband ironstone
A dark variety of clay ironstone containing sufficient carbonaceous matter
(10% to 20%) to make it self-calcining (without the addition of extra
fuel). Syn:blackband
See:blackband
A piece of bituminous shale embedded in the rock immediately over the coal
measure and liable to fall of its own weight when the coal beneath it has
been removed. CF:kettle bottom
As applied to heat radiation, this term signifies that the surface in
question emits radiant energy at each wavelength at the maximum rate
possible for the temperature of the surface and, at the same time, absorbs
all incident radiation. Only when a surface is a black body can its
temperature be measured accurately by means of an optical pyrometer.
Dodd
A separate and self-contained electronic unit or element of an electronic
device which can be treated as a single package. NCB
A bluish-black carbonaceous clay, shale, or slate, used as a pigment or
crayon. AGI
See:asbolan
The mixture of amalgam gold and magnetite obtained from behind the riffles
in a gold sluice. CTD
A name given to the impure metallic copper produced in blast furnaces
running on oxide ores or roasted sulfide material; an alloy of copper with
one or more other metals generally containing several percent of iron,
commonly lead, and many other impurities; also contains 1% to 3% sulfur.
See also:tenorite
An earthy, black, massive, or scaley form of copper oxide, CuO.
See also:melaconite; tenorite. Hess
An intense black to dark brown coral used in beads, bracelets, art
objects, etc.
In India, soil from 6 to 10 ft (1.8 to 3.0 m) in thickness overlying the
coal measures, which, in dry weather, shrinks and produces mud cracks.