A mixture of paragonite plus muscovite.
A variety of marcasite. Syn:white copper ore
Atom rendered radioactive and thus traceable through a chemical process or
a flow line. Also called tagged atom. Pryor, 3
Said of rocks and minerals that are mechanically or chemically unstable;
easily decomposed. CF:unstable
Easily decomposable plant and animal products such as fats and oils or
proteins that are found in peat and sapropels. Tomkeieff
The property of bituminous emulsions, relating to the ease with which they
break when put into use. Labile emulsions are quick breaking.
Nelson
a. A shaft, cavity, or other part of a mine from which ore is being or has
been extracted; a working, as a labor in a quicksilver mine.
See also:working
b. The annual assessment work required on claims calls for $100.00 of
labor and improvements. In Australia, claims have continuous labor or are
manned throughout the year. von Bernewitz
c. A Spanish term used in early land surveys in Texas for unit of area
equal to about 177.14 acres (representing a tract 100 varas square).
Pronounced la-bore. AGI
In the iron and steel industry, the space between the fire and flue
bridges of a reverberatory furnace in which the work is performed. Also
called "kitchen and hearth." Fay
A self-priming centrifugal pump containing a trap, which always ensures
sufficient water for the pump to function, and also a separator to remove
the entrained air in the water. Lewis
Optical diffraction of monochromatic light, commonly blue, caused by
exsolution lamellae in some labradorite samples; appears to come from
within the sample. CF:labrador moonstone
See:orthopyroxene
A triclinic mineral, (Ca,Na)[(Al,Si)AlSi2 O8 ] ; CaAl 70 to
50 mol % and NaSi 30 to 50 mol %; plagioclase series of the feldspar
group; a common rock-forming mineral in basalt, gabbro, and anorthosite;
also in hornfels and siliceous marble.
A variety of labradorite displaying an internal play of colors.
See:labradorescence
See:labradorite
A monoclinic mineral, (K,Ba,Na)(Ti,Nb)(Si,Al)2 (O,OH)7 .H
2 O . Also spelled labuntzovite; labountsovite.
a. A series of canals through which a stream of water is directed for
sorting crushed ore according to its specific gravity. Fay
b. A pipe or chamber of many turnings, for condensing metal vapors or
fumes. Standard, 2
See:laccolith
A concordant igneous intrusion with a known or assumed flat floor and a
postulated, dikelike feeder commonly thought to be beneath its thickest
point. It is generally plano-convex in form and roughly circular in plan,
less than 5 miles (8 km) in diameter, and from a few feet to several
hundred feet in thickness. See also:phacolith
AGI
Eng. Line cut, with the point of a pick, on slickensides.
a. The timber or other material placed behind and around the main
supports. See also:lagging; lofting. Nelson
b. Strips or light bars of wrought iron bent over at the ends and wedged
between the bars and the roof. Fay
c. Small boards or patches that prevent dirt from entering an excavation
through spaces between sheeting or lagging planks. Nichols, 1
d. Bars placed diagonally to space and stiffen members, as in a built-up
column. Crispin
e. Eng. Wood placed inside the sets of timber as a tie from prop to prop.
Also called stringing piece. See also:bracing
f. N. Staff. Timbers placed across the tops of bars or caps to secure the
roof between the timbers. Fay
Ire. A thin pan under the moors. Arkell