Method of analysis based on the intensity of fluorescence measured when
using ultraviolet light. Pryor, 3
A nonmetallic element, the lightest of the halogens; it is a pale yellow,
corrosive gas, that is highly toxic. Symbol, F. It is the most
electronegative and reactive of all the elements. Fluorine occurs chiefly
in fluorite (CaF2 ) and cryolite (Na2 AIF6 ), but is
widely distributed in other minerals. Used in producing uranium and many
high-temperature plastics. Handbook of Chemistry and Physics, 3
An isometric mineral, CaF2 ; perfect octahedral cleavage;
transparent to translucent; defines 4 on the Mohs hardness scale; in veins
as a gangue mineral; in carbonate rocks; an accessory in igneous rocks.
Syn:fluorspar; fluor; Derbyshire spar.
A group name for the fluorite-rich micas, natural or artificial.
See:fluor
A device for measuring the intensity of fluorescence. Bennett
An instrument consisting of a fluorescent screen and a source of ionizing
radiation. Used to examine the image formed by opaque objects placed in
the beam. ASM, 1
An inspection procedure in which the radiographic image of the subject is
viewed on a fluorescent screen; normally limited to low-density materials
or to thin sections of metals because of the low-light output of the
fluorescent screen at safe levels of radiation. ASM, 1
See:fluor
See:fluorite
See:fluor
A method of roasting, applied to finely divided material, in which air
with sufficient strength is blown through a heated bed of mineral to keep
it fluid, while reaction is controlled by continuous adjustment of rate of
feed, cooling water, and added fuel (including oxygen in air). Train of
appliances includes instrument controls, air compressor, dust-collecting
cyclones, and feed pump. Pryor, 3
a. To operate a placer mine, where the continuous supply of water is
insufficient, by holding back the water and releasing it periodically in a
flood. Webster 3rd
b. To fill underground spaces, as in coal mines, with material carried by
water, which after drainage forms a compact mass. Webster 2nd
c. See:hydraulic mine filling
a. A drilling method in that water or some other thicker liquid, such as a
mixture of water and clay, is driven into the borehole through the rod and
bit. The water rises along the rod on its outer side, between the walls of
the borehole and the rod, with such a velocity that the broken rock
fragments are carried up by this water current (direct flushing).
Alternatively, water enters the borehole around the rod and issues upwards
through the rod (indirect flushing). Stoces
b. In a colliery, diversion of ventilation to clear foul atmosphere (a
dangerous method.) Pryor, 3
c. See:hydraulic stowing
d. In oil-well production, use of gravitated ground water to force oil or
gas to the surface. Pryor, 3
See:flush
Lengths (usually 10 ft or 3 m) of steel tubing provided with a box thread
at one end and a matching pin thread on the opposite end. Coupled, the
lengths form a continuous tube having uniform inside and outside diameters
throughout its entire length. Syn:casing
Water used to assist the flow of materials in chutes or launders.
CF:top water
a. A groove parallel or nearly parallel to the axis of a cylindrical
piece, such as the grooves of a split-ring core lifter or the grooves in a
core-barrel stabilizer ring. Also applied to grooves or webs following a
corkscrewlike course around the outside surface of a cylindrical object,
like the spiraled webs on an auger stem or rod. Long
b. A primary sedimentary structure, commonly seen as a flute cast,
consisting of a discontinuous scoop-shaped or lobate depression or groove
generally 2 to 10 cm in length, usually formed by the scouring action of a
turbulent, sediment-laden current of water flowing over a muddy bottom,
and having a steep or abrupt upcurrent end where the depth of the mark
tends to be the greatest. Its long axis is generally parallel to the
current. CF:facet
Core, the outside surface of which is spirally grooved or fluted.
Syn:corkscrew core
A peculiar method of surface decay by which granite or granite gneisses
are left with a corrugated or fluted surface. In a large subangular
fragment of granite, one side contains a dozen of these little channels,
from 1 to 4 in (2.5 to 10.2 cm) deep and from 3 to 10 in (7.6 to 25.4 cm)
apart from center to center. These channels run straight down the face of
the rock. AGI
a. Of or pertaining to a river or rivers. AGI
b. Existing, growing, or living in or about a stream or river. AGI
c. Produced by the action of a stream or river; e.g., sand and gravel
deposits. Syn:fluviatile
See:fluvial
action (e.g., fluviatile dam, or fluviatile sands) and for river life
(e.g., fluviatile fauna). AGI