a. Calcite crystals containing abundant sand grains.
b. Siliceous calcite.
A machine comprising a stationary cylinder into which the sand is charged.
Inside this cylinder is fitted a main shaft onto which are bolted
retaining discs whose main function is to prevent the loose ball in
between each disc from traveling laterally. As the discs rotate on the
shaft, the lumpy sand is moved into contact with the balls, which crush
the sand to grain size. Osborne
A large euhedral or subhedral crystal (as of barite, gypsum, and esp.
calcite) loaded with detrital-sand inclusions (up to 60%), developed by
growth in an incompletely cemented sandstone during cementation.
See also:crystal sandstone
Name in the trade for diamonds occurring in the gravels and old marine
deposits on the Gold Coast of Africa. Griffith
A sedimentary dike consisting of sand that has been squeezed or injected
upward into a fissure. See also:neptunian dike
Drill-string equipment, casing, or drivepipe so firmly fastened in a
borehole by reason of caving walls or impaction of sand, mud, or drill
cuttings that the article cannot be pulled from the borehole. Long
A flotation process that uses, instead of an acid bath in deep pans, a
dilute solution of aluminum sulfate in shallow pans. Liddell
Hydraulic filling, stowing. Use of sand or plant tailings, conveyed
underground by water to support cavities left by extraction of ore.
Pryor, 3
A filter for purifying domestic water, consisting of specially graded
layers of aggregate and sand, through which the water flows slowly
downwards. A similar type of filter is used for treating sewage effluent,
but has coarser sand. Hammond
Fine-grained sandstone that can be readily split into flagstones.
AGI
A sand bed in the floor near the blast furnace into which the molten pig
is run to be cast into convenient sizes for handling. Mersereau, 2
The use of well-graded sand, mixed with water, as the medium for washing
coal, as in the Chance washer. See also:dense-medium washer
Nelson
See:sand pump
A cavity in a pump barrel to catch sand and keep it out of the way of the
plunger or buckets. Standard, 2
One who charges mixing mill and removes mixture of sand and refractory
clay to be used in packing around ware in bisque firing. DOT
A device consisting essentially of a sandbox and a series of plungers for
gradually lowering into position a heavy weight, supported by the
plungers, by running out the sand below. Webster 3rd
Sand leaching or percolation may be practiced wherever the ore is coarse
enough to permit free passage of the solvent through the voids. The ore is
loaded into large vats or tanks that are then filled with leaching
solution. After the solution has been in contact with the ore for a
certain time, it is withdrawn, and fresh solution is added. Liquid may be
added from the top (downward percolation) or from the bottom (upward
percolation). See also:percolation
A laborer who switches flow of sand (waste minerals and water resulting
from treatment of ore for removal of valuable minerals) in pipe or flumes
from one stope (underground openings from which ore has been mined) to
another, so that they will be properly filled with sand (after water has
drained off) to support the walls and roof and prevent caving of the
ground surrounding the worked out area. DOT
A body of sand and binder surrounding a cavity for the reception of molten
metal in the production of castings. The cavity must have dimensional
accuracy, and the sand surrounding it must be of sufficient stability to
allow the metal to solidify in the exact shape of the impression. The
production of the sand mold involves making a pattern of the part to be
cast, and packing molding sand round the pattern, which when withdrawn
leaves the cavity into which the metal is poured, cores being inserted to
leave cavities where desired in the casting. Osborne
A machine for mixing sand and binders by a kneading and squeezing action
for use in sand molds. The mixture is usually sand, clay, and water, but
synthetic chemical binders may be used. Osborne
A pipe formed in sedimentary rocks, filled with sand. See also:pipe
AGI