A sedimentary dike formed by the filling of a fissure from above with
sedimentary material. AGI
The phenomenon involved in the operation of a thermocouple. Named for
Thomas Seebeck, the German scientist, who first observed the phenomenon in
1822. See also:thermocouple
A small charge of material added to a supersaturated solution to initiate
precipitation. ASM, 1
Gypsum beds of loose small crystals. New South Wales
In chemical treatment, addition of tiny crystals of material to a
supersaturated solution to induce nuclear precipitation. Pryor, 3
See:line of seepage
A small cone, made in the laboratory of a mixture of clay and salt, that
softens at a definite, known temperature. It is used in the manufacture of
refractories. It has also been used in volcanology to determine the
approximate temperature of a molten lava. Syn:pyrometric cone
AGI
See:sagger
a. Pac. To separate the undivided joint ownership of a mining claim into
smaller individually segregated claims.
b. In geology, to separate from the general mass, and collect together or
become concentrated at a particular place or in a certain region, such as
in the process of crystallization or solidification.
See also:segregated vein
A fissure whose mineral filling is derived from the country rock by the
action of percolating water. CF:infiltration vein
See also:lateral secretion
a. A secondary feature formed as a result of chemical rearrangement of
minor constituents within a sediment after its deposition; e.g., a nodule
of iron sulfide, a concretion of calcium carbonate, or a geode.
AGI
b. Partial reseparation of a previously mixed batch of material into its
constituents, as a result of differences in particle size or density.
Segregation can occur in storage bins, on conveyors, and in feeders during
dry or semidry processing. Dodd
A compositional banding in gneisses that is not primary in origin, but
rather is the result of segregation of material from an originally more
nearly homogeneous rock. AGI
The survey of a mining claim located on lands classified as agricultural.
See:cobaltite
A monoclinic mineral, Na4 MnTi(Zr1.5 Ti0.5 )O2
(F,OH)(Si2 O7 ) ; forms brown-red needles embedded in
microcline in a nepheline syenite pegmatite; near Lake Seidozero, Lovozero
massif, Kola Peninsula, Russia.
A long, sharp-crested dune extending in the direction of the wind that
constructed it. Mather
In this instrument, the internal comparison lamp is set to a standard
brightness as indicated by a photoelectric cell and not by reference to a
voltmeter or ammeter. Roberts, 2
a. Pertaining to, characteristic of, or produced by earthquakes or earth
vibration; as, seismic disturbances; seismic records. Standard, 2
b. Pertaining to sound waves generated by earthquakes or artificially by
explosives to map subsurface structure. Wheeler, R.R.
See:seismicity
A quick, easy, and inexpensive method of determining the consolidation of
overburden. The process is based on the principle that sound or shock
waves travel through different subsurface materials at varying speeds and
along different paths. By this method the operator can determine whether
overburden can be ripped or whether it will need to be drilled and
blasted. Coal Age, 3
The region affected by a particular earthquake. AGI