See:potash
See:sylvite
The minerals microcline, orthoclase, and sanidine. Syn:potash feldspar;
potash spar; K-feldspar; K-spar.
This compound, which approximates in composition to K2 Ti6 O
13 and melts at 1,370 degrees C, can be made into fibers for use as
a heat-insulating material. Dodd
See:geode
A large boulder or concretion having the rounded appearance of the bottom
of an iron pot and easily detached from the roof of a coal seam.
See also:camel back; kettle bottom; tortoise. CF:caldron bottom;
bell. Syn:pot; potstone.
Inferior opal that does not exhibit play of color; found in association
with precious opal (Australia).
a. The words potential and voltage are synonymous and mean electrical
pressure. The potential of a circuit, machine, or any piece of electrical
apparatus means the voltage normally existing between the conductors of
such a circuit or the terminals of such a machine or apparatus. In U.S.
Bureau of Mines practice: (1) any potential less than 301 V shall be
deemed a low potential; (2) any potential greater than 301 V but less than
651 V shall be deemed a medium potential; and (3) any potential in excess
of 651 V shall be deemed a high potential.
b. Any of several different scalar quantities, each of which involves
energy as a function of position or of condition; e.g., the fluid
potential of groundwater. AGI
This is the region in which, if a sufficient quantity of explosive is
used, the rock will be shattered and projected outward to form a crater.
Leet, 2
Any ion which leaves the surface of a solid immersed in aqueous liquid
before equilibrium (saturation point) has been reached, while an
electrical double layer is building up and zeta-potential develops.
Pryor, 4
The difference in electric potential between two points; represents the
work involved or the energy released in the transfer of a unit amount of
electricity between them. AGI
The form of mechanical energy a body possesses by virtue of its position.
If a body is being dropped from a higher to a lower position, the body is
losing potential energy, but if a body is being raised, then it gains
potential energy. Morris
An ascending or descending value of voltage related to a linear
measurement, such as a distance along the Earth surface or ground.
USBM, 2
Inferred reserves. See:reserves
An imaginary surface representing the total head of ground water; defined
by the level to which water will rise in a well. The water table is a
particular potentiometric surface. Syn:piezometric surface;
pressure surface. AGI
a. A kettlelike or circular depression, generally deeper than wide, worn
into the solid rock in a stream bed at falls and strong rapids by sand,
gravel, and stones being spun around by the force of the current. Also
called a kettle hole; swallow hole. Fay
b. A kettlelike to irregular steep-walled subcircular interruption of
bedding in the Merensky Reef of the Bushveld Complex, South Africa. It is
filled with younger material.
c. A term used in Death Valley, California, for a circular opening, about
a meter in diameter, filled with brine and lined with halite crystals.
AGI
d. An underground system of pitches and slopes. Applied in some cases to
single pitches reaching the surface.
e. A rounded, steep-sided depression resulting from downward surface
solution. AGI
f. The occurrence, in the nether roof of a coal seam, of an irregularly
shaped mass generally broader at its base than elsewhere and with smooth
sides (slickensides). TIME
g. A circular or funnel-shaped depression in the surface caused by
subsidence. Hudson
h. A rounded cavity in the roof of a mine caused by a fall of rock, coal,
ore, etc.
i. A vertical pitch open to the surface.
j. See:abyss
A small limekiln. Webster 3rd
a. An obsolete term for graphite or black lead. AGI; Fay
b. Graphite used on the bottoms of racing boats.
Eng. Flattened oval dogger of flaggy sandstone; so called because
sometimes the upper or under layers, when split off, resemble potlids.
CF:baum pot
Foliated galena. Arkell
In glassmaking, the placing of a pot in a furnace for the purpose of
melting metal. Standard, 2