A hexagonal mineral, BeMg3 Al8 O16 ; hoegbomite
group; a dimorph of musgravite; violet-red.
Token, check, tally. Syn:teller
Translucent to opaque and white to bluish white opaline silica of organic
origin (deposited with the joints of a bamboo shoot), valued in the East
Indies as a medicine and used in native jewelry. Also spelled tabaschir or
tabashir.
A mixture of lime with shells, gravel, or stones in equal proportions,
with an equal proportion of water, forming a mass that when dry becomes as
hard as rock; a substitute for bricks or stone in building. Fay
Trade name for a variety of solid asphalt found in veins in Tabby Canyon,
UT.
a. See:rotary table
crushed particles of ore or coal from gangue. Weed, 2
c. In placer mining, a wide, shallow sluice box designed to recover gold
or other valuable mineral from screened gravel. See also:undercurrent
Hess
a. An early style of fashioning diamonds in which opposite points of an
octahedron were ground down to squares to form a large cutlet and a larger
table, the remaining parts of the eight octahedral faces being polished.
b. A term used somewhat loosely to describe any one of the variations of
the "bevel cut," provided it has the usual large table of that cut.
Syn:bevel cut
A relatively flat diamond of table cut. Webster 3rd
Flotation process practiced on a shaking table. Ore or coal is ground,
deslimed, conditioned, and fed to table as thick slurry. Flotable
particles become glomerules, held together by minute air bubbles and edge
adhesion. These roll across and are discharged nearly opposite the feed
end. The process is helped by jets of low-pressure air from piping set
across table. Tailings work along deck to discharge end. Pryor, 3
a. A general term for a broad, elevated region with a nearly level or
undulating surface of considerable extent; e.g., South Africa. AGI
b. A plateau bordered by abrupt clifflike edges rising sharply from the
surrounding lowland; a mesa. AGI
See:tabular spar; wollastonite.
Separation of two materials of different densities by passing a dilute
suspension over a slightly inclined table having a reciprocal horizontal
motion or shake with a slow forward motion and a fast return.
Bennett
a. Said of a feature having two dimensions that are much larger or longer
than the third, such as a dike, or of a geomorphic feature having a flat
surface, such as a plateau. AGI
b. Said of the shape of a sedimentary body whose width to thickness ratio
is greater than 50:1, but less than 1,000:1 (Krynine, 1948); e.g., a
graywacke formation in a geosynclinal deposit. CF:blanket; prism.
AGI
c. Said of a sedimentary particle whose length is 1.5 to 3 times its
thickness (Krynine, 1948). CF:prismatic
d. Said of a metamorphic texture in which a large proportion of grains are
tabular and have approximately parallel orientation (Hart, 1977)
AGI
e. Said of a crystal form that shows one dimension markedly smaller than
the other two.
f. Tabular crystals, such as wollastonite, may occur in tables, plates,
disks, foliae, and scales. Schieferdecker; AGI
g. A mineral showing broad, flat surface, e.g., wollastonite.
Nelson
h. See:tabular deposit
i. Refers to crystals that have three distinctly different dimensions.
CF:acicular; anisodesmic; equant.
A crystal flattened parallel to any face. Standard, 2
A flat tablelike or stratified bed; e.g., a coal seam. See:tabular
Nelson
Wollastonite in tabular form. Syn:table spar
The structure of a mineral or rock that makes it tend to separate into
plates or laminae. AGI
A modified double-spiral cut, the benefits of which are that the holes are
located vertically below one another on one and the same line to
facilitate drilling. Langefors
A monoclinic mineral, Ca12 Al2 Si18 O51 .18H
2 O .
See:tachymeter; subtense bar.
An instrument for measuring speed. In mining it is used on hoists lifting
cages, cars, or skim in shafts or slope. Zern