A two-handled frame for carrying well-boring tools. Standard, 2
An early popular name for selenite, alluding to its transparency.
Fay
Record of the radiation spectrum and relative intensities of gamma rays
emitted by strata penetrated in drilling. Because of their different
energies the relative amounts of radioactivity contributed by different
elements can be determined. CF:gamma-ray well log
See also:radioactivity log
An optical instrument similar to, but more versatile than, the simple
spectroscope. Scales are provided for reading angles. A wavelength
spectrometer is one designed or equipped in a manner to measure the
wavelengths at which absorption bands occur in an absorption spectrum.
An instrument to detect very slight differences in color of solutions of
different chemicals and thus measure the quantity of the chemical present.
It consists of a light source, an optical prism for providing
monochromatic light; i.e., light of a single wavelength only, and a device
for measuring the intensity of the light beam after it has passed through
the solution. Traces of aluminum in steel may be determined in this way.
Also called spekker. Nelson
a. A band of light showing in orderly succession the rainbow colors or
isolated bands or colors corresponding to different wavelengths, as seen
through a spectroscope or photographed in a spectrograph. The visible
spectrum is only a small region in the vast spectrum of electromagnetic
waves, which extend from the longest radio waves to the minutely short
waves (gamma rays) emitted by radioactive elements.
See also:emission spectrum; continuous spectrum; absorption spectrum.
Anderson
b. An array of visible light ordered according to its constituent
wavelengths (colors) by being sent through a prism or diffraction grating.
AGI
c. An array of intensity values ordered according to any physical
parameter, e.g. energy spectrum, mass spectrum, velocity spectrum.
AGI
d. Amplitude and phase response as a function of frequency for the
components of a wavetrain, such as given by Fourier analysis, or as used
to specify filter-response characteristics. Pl: "spectra." Adj:
"spectral."
The hues or wavelengths into which white light is separated upon passing
through a transparent prism, six of which are readily distinguished by the
normal human eye: red, orange, yellow, green, blue, and violet.
See also:visible spectrum
outside the visible range.
Mirrorlike, as specular iron ore, which is a hard variety of hematite.
See also:specularite
See:specularite
Variety of hematite, Fe2 O3 , black, lustrous, metallic
gleam. Mohs hardness, 5.5 to 6.5. May be micaceous in form. Contains 70%
iron; sp gr, 4.9 to 5.3. See also:specularite; hematite.
Pryor, 3
A variety of hematite with brilliant black color and metallic luster.
See:hematite
A black or gray variety of hematite with splendant metallic luster, often
showing iridescence; occurs in micaceous or foliated masses or in tabular
or disklike crystals. Syn:specular hematite; gray hematite.
See also:hematite; specular iron; iron glance.
Metamorphosed oxide-facies iron formation characterized by a high
percentage of strongly aligned flakes of specular hematite.
CF:itabirite
Mica. Standard, 2
Undiscovered resources that may occur either in known types of deposits in
favorable geologic settings where mineral discoveries have not been made,
or in types of deposits as yet unrecognized for their economic potential.
If exploration confirms their existence and reveals enough information
about their quantity, grade, and quality, they will be reclassified as
identified resources. USGS, 2
The length of belt, chain, cable, or other linkage which passes a fixed
point within a given time. It is usually expressed in terms of feet per
minute. In the case of the rolling chain conveyor, the load is moved at a
rate double the chain speed. In screw conveyors, the speed is expressed in
terms of revolutions per minute and the speed at which the material is
conveyed is dependent upon speed, pitch of the screw, type of flight,
angle of inclination, nature of material, etc.
A calcium carbide method for the quick determination of moisture. A
pressure gage is calibrated to give direct values of moisture content
percent of soil samples. Nelson
Metallic arsenides and antimonides smelted from cobalt and lead ores.
Pryor, 3
See:smaltite
One who scientifically investigates caverns.
The scientific study or exploration of caverns and related features.