a. A natural underground opening or void, which may be small or large.
See also:cave; vug. Long
b. The bubble formed by a projectile at water entry. Hy
c. A void in a bit caused by a bubble of gas entrapped in the matrix
material during the manufacturing process. Long
A deposition of minerals in a cavity or rock opening. Bateman, 2
a. Eng. Sulfate of barium heavy spar. See also:barite
b. Scot. Chalk; limestone. Also spelled cauk. Fay
Walls of a vein; chest. Hess
a. In crystallography, a symmetrically unique reference vector, oriented
vertically by convention. In the monoclinic system, the second setting
orients the c axis at the nonorthogonal angle beta to the unique b axis,
the diad. In the triclinic system, all axes are unique with the c axis
designated by convention. CF:a axis; b axis.
b. One of three orthogonal reference axes, a, b, and c that are used in
structural geology.
c. To help describe the geometry of a fabric that possesses monoclinic
symmetry, the c axis lies in the unique symmetry plane at right angles to
a prominent fabric plane; thus in many tectonites the c axis is normal to
the schistosity.
d. In a kinematic sense, to describe a deformation plan that possesses
monoclinic symmetry, such as a progressive shear. Here the c axis lies in
the unique symmetry plane and normal to the movement plane. In a
progressive simple shear, the c axis lies normal to the shear plane.
Syn:c direction
See:c axis
The convergence-divergence principle used in the Frenkel mixer.
Dodd
This nonautomatic detector has the appearance of a mine official's
electric hand lamp. It indicates on an illuminated scale percentages of
methane from 0 to 3 in steps of 0.1. When a test for combustible gases is
to be made, the projecting front piece is turned part of a revolution;
this extinguishes the main light and lights up the illuminated scale. A
sample of air is flushed into the detector by means of a small aspirator
(or hand pump), the button switch at the side is operated, and the
percentage of combustible gases, if any, is indicated on the illuminated
scale. Cooper
See:chemawinite
The concentration of an airborne substance that shall not be exceeded
during any part of the working exposure. ANSI
The mineral monoclinic K(Mg,Fe)(Fe,Al)Si4 O10 (OH)2 ;
mica group; soft; green or gray-green; earthy; generally occurs in
cavities in basaltic rocks. Formerly called kmaite. Syn:svitalskite
CF:glauconite
An orthorhombic mineral, 4[SrSO4 ] ; barite group; disseminated
through limestone and sandstone; a source of strontium. Also called
celestite.
See:celestine
A constituent of Portland cement clinkers. Also spelled celith.
See also:brown millerite
a. A compartment in a flotation machine. Hess
b. A single element of an electric battery, either primary or secondary.
Crispin
c. Battery unit consisting of two electrodes separately contacting an
electrolyte so that there is a potential difference between them.
Bennett
d. See:galvanic cell; local cell.
Excavated area under a drill-derrick floor to provide headroom for casing
and pipe connections required at the collar of a borehole, or to serve as
a covered sump. See also:cave
The material supplied to the cell in the electrolytic production of
metals. ASM, 1
A network along grain boundaries, which may originate by segregation on
exsolution. A similar texture may form by the replacement of organic
forms, esp. cell walls, by ore minerals. Schieferdecker
Said of the texture of a rock (e.g., a cellular dolomite) characterized by
openings or cavities, which may or may not be connected. Although there
are no specific size limitations, the term is usually applied to cavities
larger than pores and smaller than caverns. The syn. vesicular is
preferred when describing igneous rocks. CF:porous; cavernous;
vesicular. AGI
A cofferdam, with a double wall, consisting of steel sheet piling arranged
in intercepting rings about 50 ft (15 m) in diameter. The space between
the lines of piling is filled with sand. Hammond
A polymeric carbohydrate composed of glucose units, formula (C6 H
10 O5 )x , making it the most abundant carbohydrate,
and with lignin, an important constituent of plant materials, from which
coal is formed. AGI